diff --git a/nested/src/editors/list/editor.rs b/nested/src/editors/list/editor.rs
index 43b8656..e3668e1 100644
--- a/nested/src/editors/list/editor.rs
+++ b/nested/src/editors/list/editor.rs
@@ -103,7 +103,7 @@ impl ListEditor {
 
     pub fn get_seq_type(&self) -> TypeTerm {
         TypeTerm::Type {
-            id: self.ctx.read().unwrap().get_typeid("Sequence").unwrap(),
+            id: self.ctx.read().unwrap().get_typeid("List").unwrap(),
             args: vec![ self.get_item_type() ]
         }        
     }
@@ -277,4 +277,24 @@ impl ListEditor {
         }
     }
 }
+/*
+use crate::{
+    type_system::TypeLadder,
+    tree::{TreeType, TreeAddr}
+};
 
+impl TreeType for ListEditor {
+    fn get_type(&self, addr: &TreeAddr) -> TypeLadder {
+        let idx = crate::utils::modulo::modulo(addr.0[0] as isize, self.data.len() as isize) as usize;
+
+        let mut addr = addr.clone();
+        
+        if self.data.len() > 0 {
+            addr.0.remove(0);
+            self.data.get(idx).get_type(addr)
+        } else {
+            vec![]
+        }
+    }
+}
+*/
diff --git a/nested/src/editors/list/pty_editor.rs b/nested/src/editors/list/pty_editor.rs
index 3e81118..c12c237 100644
--- a/nested/src/editors/list/pty_editor.rs
+++ b/nested/src/editors/list/pty_editor.rs
@@ -19,7 +19,7 @@ use {
             make_label
         },
         tree::{TreeCursor, TreeNav},
-        diagnostics::{Diagnostics, make_error},
+        diagnostics::{Diagnostics},
         tree::NestedNode,
         commander::Commander,
         PtySegment
@@ -179,7 +179,6 @@ impl PTYListEditor {
 
         let ed = editor.read().unwrap();
         let edd = ed.editor.read().unwrap();
-
    
         NestedNode::new()
             .set_data(edd.get_data())
@@ -354,7 +353,7 @@ impl Commander for PTYListEditor {
                                     e.delete_nexd();
                                 }
                                 _ => {
-                                    let mut new_edit = Context::make_editor(&e.ctx, e.typ.clone(), self.depth).unwrap();
+                                    let mut new_edit = Context::make_node(&e.ctx, e.typ.clone(), self.depth).unwrap();
                                     new_edit.goto(TreeCursor::home());
                                     new_edit.handle_terminal_event(event);
 
diff --git a/nested/src/editors/product/editor.rs b/nested/src/editors/product/editor.rs
index 0f69cfd..64ab5c6 100644
--- a/nested/src/editors/product/editor.rs
+++ b/nested/src/editors/product/editor.rs
@@ -235,7 +235,7 @@ impl TerminalEditor for ProductEditor {
                         }
                     }
                 } else {
-                    let mut e = Context::make_editor(&self.ctx, t[0].clone(), *ed_depth+1).unwrap();
+                    let mut e = Context::make_node(&self.ctx, t[0].clone(), *ed_depth+1).unwrap();
                     *editor = Some(e.clone());
                     update_segment = true;
 
diff --git a/nested/src/editors/product/nav.rs b/nested/src/editors/product/nav.rs
index ac855e7..89354d2 100644
--- a/nested/src/editors/product/nav.rs
+++ b/nested/src/editors/product/nav.rs
@@ -71,7 +71,7 @@ impl TreeNav for ProductEditor {
                         e.goto(c.clone());
                     } else if c.tree_addr.len() > 0 {
                         // create editor
-                        let mut e = Context::make_editor(&self.ctx, t[0].clone(), *ed_depth+1).unwrap();
+                        let mut e = Context::make_node(&self.ctx, t[0].clone(), *ed_depth+1).unwrap();
                         *editor = Some(e.clone());
                         e.goto(c.clone());
                     }
@@ -128,7 +128,7 @@ impl TreeNav for ProductEditor {
                             } else {
                                 // create editor
 
-                                let mut e = Context::make_editor(&self.ctx, t[0].clone(), *ed_depth+1).unwrap();
+                                let mut e = Context::make_node(&self.ctx, t[0].clone(), *ed_depth+1).unwrap();
                                 *editor = Some(e.clone());
                                 e.goby(direction);
                             }
diff --git a/nested/src/editors/sum/editor.rs b/nested/src/editors/sum/editor.rs
index bb4d432..1261616 100644
--- a/nested/src/editors/sum/editor.rs
+++ b/nested/src/editors/sum/editor.rs
@@ -3,9 +3,6 @@ use {
         view::{
             ViewPort, OuterViewPort,
             sequence::*,            
-        },
-        buffer::{
-            vec::*
         }
     },
     crate::{
diff --git a/nested/src/tree/addr.rs b/nested/src/tree/addr.rs
index 62210a1..6af5dcd 100644
--- a/nested/src/tree/addr.rs
+++ b/nested/src/tree/addr.rs
@@ -1,5 +1,5 @@
 
-pub struct TreeAddr(Vec<usize>);
+pub struct TreeAddr(pub Vec<usize>);
 
 impl From<Vec<usize>> for TreeAddr {
     fn from(v: Vec<usize>) -> TreeAddr {
diff --git a/nested/src/tree/mod.rs b/nested/src/tree/mod.rs
index 94fbb14..27f9c5b 100644
--- a/nested/src/tree/mod.rs
+++ b/nested/src/tree/mod.rs
@@ -2,11 +2,13 @@ pub mod addr;
 pub mod cursor;
 pub mod nav;
 pub mod node;
+pub mod treetype;
 
 pub use {
     addr::TreeAddr,
     cursor::TreeCursor,
     nav::{TreeNav, TreeNavResult},
+    treetype::{TreeType},
     node::NestedNode
 };
 
diff --git a/nested/src/tree/node.rs b/nested/src/tree/node.rs
index 709d28c..8ed3f6a 100644
--- a/nested/src/tree/node.rs
+++ b/nested/src/tree/node.rs
@@ -52,6 +52,17 @@ impl ObjCommander for NestedNode {
     }
 }
 
+/*
+impl TreeType for NestedNode {
+    fn get_type(&self, addr: &TreeAddr) -> TypeLadder {
+        if let Some(editor) = self.editor {
+            editor.read().unwrap().get_type(addr)
+        } else {
+            vec![]
+        }
+    }
+}
+*/
 // todo: remove that at some point
 impl TerminalEditor for NestedNode {
     fn get_term_view(&self) -> OuterViewPort<dyn TerminalView> {
diff --git a/nested/src/tree/treetype.rs b/nested/src/tree/treetype.rs
new file mode 100644
index 0000000..975dbc4
--- /dev/null
+++ b/nested/src/tree/treetype.rs
@@ -0,0 +1,14 @@
+
+use {
+    crate::{
+        type_system::TypeLadder,
+        tree::{TreeAddr}
+    }
+};
+
+pub trait TreeType {
+    fn get_type(&self, _addr: &TreeAddr) -> TypeLadder {
+        vec![]
+    }
+}
+
diff --git a/nested/src/type_system/context.rs b/nested/src/type_system/context.rs
index a15cad4..1dd6679 100644
--- a/nested/src/type_system/context.rs
+++ b/nested/src/type_system/context.rs
@@ -35,29 +35,50 @@ pub enum MorphismMode {
 
 #[derive(Clone, Hash, PartialEq, Eq)]
 pub struct MorphismType {
-    pub mode: MorphismMode,
-    pub src_type: TypeTerm,
+//    pub mode: MorphismMode,
+    pub src_type: Option<TypeTerm>,
     pub dst_type: TypeTerm,
 }
 
+#[derive(Hash, Eq, PartialEq, Debug)]
+pub struct MorphismTypePattern {
+    pub src_type: Option<TypeTerm>,
+    pub dst_tyid: TypeID
+}
+
+impl From<MorphismType> for MorphismTypePattern {
+    fn from(value: MorphismType) -> MorphismTypePattern {
+        MorphismTypePattern {
+            src_type: value.src_type,
+            dst_tyid: match value.dst_type {
+                TypeTerm::Type { id, args: _ } => id,
+                _ => unreachable!()
+            }
+        }
+    }
+}
+
 //<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
 
 pub struct Context {
     /// assigns a name to every type
     type_dict: Arc<RwLock<TypeDict>>,
 
-    /// objects
-    objects: HashMap<String, Arc<RwLock<ReprTree>>>,
+    /// vertices of the graph
+    nodes: HashMap< String, NestedNode >,
 
+    /// todo: beautify
     /// types that can be edited as lists
-    list_types: Vec<TypeID>,
+    list_types: Vec< TypeID >,
 
-    /// editors
-    editor_ctors: HashMap<TypeID, Arc<dyn Fn(Arc<RwLock<Self>>, TypeTerm, usize) -> Option<NestedNode> + Send + Sync>>,
-
-    /// morphisms
-    default_constructors: HashMap<TypeTerm, Box<dyn Fn() -> Arc<RwLock<ReprTree>> + Send + Sync>>,
-    morphism_constructors: HashMap<MorphismType, Box<dyn Fn(Arc<RwLock<ReprTree>>) -> Arc<RwLock<ReprTree>> + Send + Sync>>,
+    /// graph constructors
+    morphisms: HashMap<
+                   MorphismTypePattern,
+                   Arc<
+                           dyn Fn( NestedNode, TypeTerm, usize ) -> Option<NestedNode>
+                           + Send + Sync
+                   >
+               >,
 
     /// recursion
     parent: Option<Arc<RwLock<Context>>>,
@@ -70,10 +91,8 @@ impl Context {
                 Some(p) => p.read().unwrap().type_dict.clone(),
                 None => Arc::new(RwLock::new(TypeDict::new()))
             },
-            editor_ctors: HashMap::new(),
-            default_constructors: HashMap::new(),
-            morphism_constructors: HashMap::new(),
-            objects: HashMap::new(),
+            morphisms: HashMap::new(),
+            nodes: HashMap::new(),
             list_types: match parent.as_ref() {
                 Some(p) => p.read().unwrap().list_types.clone(),
                 None => Vec::new()
@@ -86,6 +105,14 @@ impl Context {
         Context::with_parent(None)
     }
 
+    pub fn depth(&self) -> usize {
+        if let Some(parent) = self.parent.as_ref() {
+            parent.read().unwrap().depth() + 1
+        } else {
+            0
+        }
+    }
+
     pub fn add_typename(&mut self, tn: String) -> TypeID {
         self.type_dict.write().unwrap().add_typename(tn)
     }
@@ -116,73 +143,97 @@ impl Context {
         self.type_dict.read().unwrap().type_term_to_str(&t)
     }
 
-    pub fn add_editor_ctor(&mut self, tn: &str, mk_editor: Arc<dyn Fn(Arc<RwLock<Self>>, TypeTerm, usize) -> Option<NestedNode> + Send + Sync>) {
-        let mut dict = self.type_dict.write().unwrap();
+    pub fn add_node_ctor(&mut self, tn: &str, mk_editor: Arc<dyn Fn(Arc<RwLock<Self>>, TypeTerm, usize) -> Option<NestedNode> + Send + Sync>) {
+        let dict = self.type_dict.clone();
+        let mut dict = dict.write().unwrap();
         let tyid =
             if let Some(tyid) = dict.get_typeid(&tn.into()) {
                 tyid
             } else {
                 dict.add_typename(tn.into())
             };
-        self.editor_ctors.insert(tyid, mk_editor);
+
+        let morphism_pattern = MorphismTypePattern {
+            src_type: None,
+            dst_tyid: tyid
+        };
+
+        self.add_morphism(morphism_pattern, Arc::new(move |node, dst_type, depth| {
+            let ctx = node.ctx.clone().unwrap();
+            mk_editor(ctx, dst_type, depth)
+        }));
     }
 
-    pub fn get_editor_ctor(&self, ty: &TypeTerm) -> Option<Arc<dyn Fn(Arc<RwLock<Self>>, TypeTerm, usize) -> Option<NestedNode> + Send + Sync>> {
-        if let TypeTerm::Type{ id, args: _ } = ty.clone() {
-            if let Some(m) = self.editor_ctors.get(&id).cloned() {
-                Some(m)
-            } else {
-                self.parent.as_ref()?
-                    .read().unwrap()
-                    .get_editor_ctor(&ty)
-            }
+    pub fn add_morphism(
+        &mut self,
+        morph_type_pattern: MorphismTypePattern,
+        morph_fn: Arc<
+                     dyn Fn( NestedNode, TypeTerm, usize ) -> Option<NestedNode>
+                     + Send + Sync
+                  >
+    ) {
+        self.morphisms.insert(morph_type_pattern, morph_fn);
+    }
+
+    pub fn get_morphism(&self, ty: MorphismType) -> Option<Arc<dyn Fn(NestedNode, TypeTerm, usize) -> Option<NestedNode> + Send + Sync>> {
+
+        let pattern = MorphismTypePattern::from(ty.clone());
+        if let Some(morphism) = self.morphisms.get( &pattern ) {
+            Some(morphism.clone())
         } else {
-            None
+            self.parent.as_ref()?
+                .read().unwrap()
+                .get_morphism(ty)
         }
     }
 
-    pub fn make_editor(ctx: &Arc<RwLock<Self>>, type_term: TypeTerm, depth: usize) -> Option<NestedNode> {
-        let mk_editor = ctx.read().unwrap().get_editor_ctor(&type_term)?;
-        mk_editor(ctx.clone(), type_term, depth)
+    pub fn make_node(ctx: &Arc<RwLock<Self>>, type_term: TypeTerm, depth: usize) -> Option<NestedNode> {
+        let mk_node = ctx.read().unwrap().get_morphism(MorphismType {
+            src_type: None,
+            dst_type: type_term.clone()
+        })?;
+
+        mk_node(NestedNode::new().set_ctx(ctx.clone()), type_term, depth)
     }
-/*
-    pub fn enrich_editor(
-        node: NestedNode,
-        typ: TypeTerm
-    ) -> NestedNode {
 
-        
-        // create view
+    pub fn morph_node(ctx: Arc<RwLock<Self>>, mut node: NestedNode, dst_type: TypeTerm) -> NestedNode {
+        let mut src_type = None;
 
-        // create commander
-        
+        if let Some(data) = node.data.clone() {
+            src_type = Some(data.read().unwrap().get_type().clone());
+            node = node.set_data(
+                ReprTree::ascend(
+                    &data,
+                    dst_type.clone()
+                )
+            );
+        }
 
-    }
-*/
-    pub fn add_morphism(
-        &mut self,
-        morph_type: MorphismType,
-        morph_fn: Box<dyn Fn(Arc<RwLock<ReprTree>>) -> Arc<RwLock<ReprTree>> + Send + Sync>,
-    ) {
-        self.morphism_constructors.insert(morph_type, morph_fn);
+        let pattern = MorphismType { src_type, dst_type: dst_type.clone() }.into();
+        if let Some(transform) = ctx.read().unwrap().get_morphism(pattern) {
+            if let Some(new_node) = transform(node.clone(), dst_type, 0) {
+                new_node
+            } else {
+                node.clone()
+            }
+        } else {
+            node
+        }
     }
 
     /// adds an object without any representations
-    pub fn add_obj(&mut self, name: String, typename: &str) {
-        let type_tag = self.type_dict.read().unwrap().type_term_from_str(typename).unwrap();
+    pub fn add_obj(ctx: Arc<RwLock<Context>>, name: String, typename: &str) {
+        let type_tag = ctx.read().unwrap()
+            .type_dict.read().unwrap()
+            .type_term_from_str(typename).unwrap();
 
-        self.objects.insert(
-            name,
-            if let Some(ctor) = self.default_constructors.get(&type_tag) {
-                ctor()
-            } else {
-                Arc::new(RwLock::new(ReprTree::new(type_tag)))
-            },
-        );
+        if let Some(node) = Context::make_node(&ctx, type_tag, 0) {
+            ctx.write().unwrap().nodes.insert(name, node);
+        }
     }
 
-    pub fn get_obj(&self, name: &String) -> Option<Arc<RwLock<ReprTree>>> {
-        if let Some(obj) = self.objects.get(name) {
+    pub fn get_obj(&self, name: &String) -> Option<NestedNode> {
+        if let Some(obj) = self.nodes.get(name) {
             Some(obj.clone())
         } else if let Some(parent) = self.parent.as_ref() {
             parent.read().unwrap().get_obj(name)
diff --git a/nested/src/type_system/make_editor.rs b/nested/src/type_system/make_editor.rs
index 05e1eea..0f926d1 100644
--- a/nested/src/type_system/make_editor.rs
+++ b/nested/src/type_system/make_editor.rs
@@ -11,7 +11,7 @@ use {
         tree::{NestedNode},        
         terminal::{TerminalEditor},
         diagnostics::{Diagnostics},
-        type_system::TypeTermEditor,
+        type_system::{TypeTermEditor, MorphismTypePattern},
     },
     std::sync::{Arc, RwLock},
     cgmath::Point2
@@ -28,7 +28,7 @@ pub fn init_mem_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
 pub fn init_editor_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     let ctx = Arc::new(RwLock::new(Context::with_parent(Some(parent))));
 
-    ctx.write().unwrap().add_editor_ctor(
+    ctx.write().unwrap().add_node_ctor(
         "Char", Arc::new(
             |ctx: Arc<RwLock<Context>>, _ty: TypeTerm, _depth: usize| {
                 Some(CharEditor::new_node(&ctx))
@@ -38,7 +38,7 @@ pub fn init_editor_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     ctx.write().unwrap().add_list_typename("Sequence".into());
 
     ctx.write().unwrap().add_list_typename("List".into());
-    ctx.write().unwrap().add_editor_ctor(
+    ctx.write().unwrap().add_node_ctor(
         "List", Arc::new(
             |ctx: Arc<RwLock<Context>>, ty: TypeTerm, depth: usize| {
                 match ty {
@@ -65,20 +65,44 @@ pub fn init_editor_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     );
 
     ctx.write().unwrap().add_list_typename("Symbol".into());
-    ctx.write().unwrap().add_editor_ctor(
-        "Symbol", Arc::new(
-            |ctx: Arc<RwLock<Context>>, _ty: TypeTerm, depth: usize| {
-                let mut node = PTYListEditor::new(
-                    ctx.clone(),
-                    ctx.read().unwrap().type_term_from_str("( Char )").unwrap(),
-                    ListStyle::Plain,
-                    depth + 1
-                ).into_node();
 
-                node.data = Some(ReprTree::ascend(
-                    &node.data.unwrap(),
-                    ctx.read().unwrap().type_term_from_str("( Symbol )").unwrap()
-                ));
+    let pattern = MorphismTypePattern {
+        src_type: ctx.read().unwrap().type_term_from_str("( List Char )"),
+        dst_tyid: ctx.read().unwrap().get_typeid("Symbol").unwrap()
+    };
+
+    ctx.write().unwrap().add_morphism(pattern,
+        Arc::new(
+            |mut node, dst_type:_, depth| {
+                let editor = node.editor.clone().unwrap().downcast::<RwLock<ListEditor>>().unwrap();
+                let pty_editor = PTYListEditor::from_editor(
+                    editor,
+                    ListStyle::Plain,
+                    depth
+                );
+
+                node.view = Some(pty_editor.pty_view());
+                node.cmd = Some(Arc::new(RwLock::new(pty_editor)));
+                Some(node)                
+            }
+        )
+    );
+
+    ctx.write().unwrap().add_node_ctor(
+        "Symbol", Arc::new(
+            |ctx: Arc<RwLock<Context>>, dst_typ: TypeTerm, depth: usize| {
+                let mut node = Context::make_node(
+                    &ctx,
+                    TypeTerm::Type {
+                        id: ctx.read().unwrap().get_typeid("List").unwrap(),
+                        args: vec![
+                            TypeTerm::new(ctx.read().unwrap().get_typeid("Char").unwrap())
+                        ]
+                    },
+                    depth
+                ).unwrap();
+
+                node = Context::morph_node(ctx, node, dst_typ);
 
                 Some(node)
             }
@@ -86,7 +110,7 @@ pub fn init_editor_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     );
 
     ctx.write().unwrap().add_list_typename("String".into());
-    ctx.write().unwrap().add_editor_ctor(
+    ctx.write().unwrap().add_node_ctor(
         "String", Arc::new(
             |ctx: Arc<RwLock<Context>>, _ty: TypeTerm, depth: usize| {
                 let mut node = PTYListEditor::new(
@@ -107,7 +131,7 @@ pub fn init_editor_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     );
 
     ctx.write().unwrap().add_list_typename("TypeTerm".into());
-    ctx.write().unwrap().add_editor_ctor(
+    ctx.write().unwrap().add_node_ctor(
         "TypeTerm", Arc::new(
             |ctx: Arc<RwLock<Context>>, _ty: TypeTerm, depth: usize| {
                 Some(TypeTermEditor::new(ctx, depth).into_node())
@@ -126,7 +150,7 @@ pub fn init_math_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     ctx.write().unwrap().add_typename("u32".into());
     ctx.write().unwrap().add_typename("BigEndian".into());
 
-    ctx.write().unwrap().add_editor_ctor(
+    ctx.write().unwrap().add_node_ctor(
         "Digit", Arc::new(
             |ctx: Arc<RwLock<Context>>, ty: TypeTerm, _depth: usize| {
                 match ty {
@@ -154,7 +178,7 @@ pub fn init_math_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     );
 
     ctx.write().unwrap().add_list_typename("PosInt".into());
-    ctx.write().unwrap().add_editor_ctor(
+    ctx.write().unwrap().add_node_ctor(
         "PosInt", Arc::new(
             |ctx: Arc<RwLock<Context>>, ty: TypeTerm, _depth: usize| {
                 match ty {
@@ -181,9 +205,9 @@ pub fn init_math_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     );    
 
     ctx.write().unwrap().add_list_typename("RGB".into());
-    ctx.write().unwrap().add_editor_ctor(
+    ctx.write().unwrap().add_node_ctor(
         "RGB", Arc::new(
-            |ctx: Arc<RwLock<Context>>, ty: TypeTerm, depth: usize| {
+            |ctx: Arc<RwLock<Context>>, _ty: TypeTerm, depth: usize| {
                 let editor = ProductEditor::new(depth, ctx.clone())
                     .with_t(Point2::new(0, 0), "r: ")
                     .with_n(Point2::new(1, 0),
@@ -225,7 +249,7 @@ pub fn init_os_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     let ctx = Arc::new(RwLock::new(Context::with_parent(Some(parent))));
 
     ctx.write().unwrap().add_list_typename("PathSegment".into());
-    ctx.write().unwrap().add_editor_ctor(
+    ctx.write().unwrap().add_node_ctor(
         "PathSegment", Arc::new(
             |ctx: Arc<RwLock<Context>>, _ty: TypeTerm, depth: usize| {
                 let mut node = PTYListEditor::new(
@@ -246,7 +270,7 @@ pub fn init_os_ctx(parent: Arc<RwLock<Context>>) -> Arc<RwLock<Context>> {
     );
 
     ctx.write().unwrap().add_list_typename("Path".into());
-    ctx.write().unwrap().add_editor_ctor(
+    ctx.write().unwrap().add_node_ctor(
         "Path", Arc::new(
             |ctx: Arc<RwLock<Context>>, _ty: TypeTerm, depth: usize| {
                 let mut node = PTYListEditor::new(
diff --git a/nested/src/type_system/mod.rs b/nested/src/type_system/mod.rs
index 27dc2fa..2db9051 100644
--- a/nested/src/type_system/mod.rs
+++ b/nested/src/type_system/mod.rs
@@ -8,7 +8,7 @@ pub mod type_term_editor;
 pub use {
     repr_tree::{ReprTree},
     type_term::{TypeDict, TypeID, TypeTerm, TypeLadder},
-    context::{Context, MorphismMode, MorphismType},
+    context::{Context, MorphismMode, MorphismType, MorphismTypePattern},
     type_term_editor::TypeTermEditor,
     make_editor::*
 };
diff --git a/nested/src/type_system/type_term.rs b/nested/src/type_system/type_term.rs
index 41f5f17..de2281d 100644
--- a/nested/src/type_system/type_term.rs
+++ b/nested/src/type_system/type_term.rs
@@ -7,7 +7,7 @@ pub type TypeLadder = Vec<TypeTerm>;
 
 //<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
 
-#[derive(Clone, PartialEq, Eq, Hash)]
+#[derive(Clone, PartialEq, Eq, Hash, Debug)]
 pub enum TypeTerm {
     Type { id: TypeID, args: Vec<TypeTerm> },
     Num(i64),
diff --git a/nested/src/type_system/type_term_editor.rs b/nested/src/type_system/type_term_editor.rs
index 86e9250..6f2807e 100644
--- a/nested/src/type_system/type_term_editor.rs
+++ b/nested/src/type_system/type_term_editor.rs
@@ -1,26 +1,15 @@
 use {
-    r3vi::{
-        view::{
-            OuterViewPort,
-            sequence::*
-        }
-    },
     crate::{
         type_system::{Context},
-        terminal::{TerminalEvent, TerminalView, TerminalEditor, TerminalEditorResult},
+        terminal::{TerminalEvent},
         editors::{
-            list::*,
             sum::*,
-            char::CharEditor,
-            integer::PosIntEditor,
         },
-        tree::{TreeNav, TreeCursor, TreeNavResult},
-        diagnostics::{Diagnostics, Message},
+        tree::{TreeNav},
         tree::NestedNode,
         commander::Commander,
         PtySegment
     },
-    cgmath::{Vector2},
     termion::event::{Key},
     std::{
         sync::{Arc, RwLock}
@@ -48,9 +37,9 @@ impl TypeTermEditor {
             ty: TypeTermVar::Any,
             sum_edit: Arc::new(RwLock::new(SumEditor::new(
                 vec![
-                    Context::make_editor( &ctx, ctx.read().unwrap().type_term_from_str("( List TypeTerm )").unwrap(), depth + 1).unwrap(),
-                    Context::make_editor( &ctx, ctx.read().unwrap().type_term_from_str("( PosInt 10 )").unwrap(), depth + 1 ).unwrap(),
-                    Context::make_editor( &ctx, ctx.read().unwrap().type_term_from_str("( Symbol )").unwrap(), depth + 1 ).unwrap()
+                    Context::make_node( &ctx, ctx.read().unwrap().type_term_from_str("( List TypeTerm )").unwrap(), depth + 1).unwrap(),
+                    Context::make_node( &ctx, ctx.read().unwrap().type_term_from_str("( PosInt 10 )").unwrap(), depth + 1 ).unwrap(),
+                    Context::make_node( &ctx, ctx.read().unwrap().type_term_from_str("( Symbol )").unwrap(), depth + 1 ).unwrap()
                 ])))
         }
     }