diff --git a/crates/tek_core/src/engine.rs b/crates/tek_core/src/engine.rs
index 354f19cf..c7fae556 100644
--- a/crates/tek_core/src/engine.rs
+++ b/crates/tek_core/src/engine.rs
@@ -15,7 +15,7 @@ pub trait Engine: Sized {
 
     /// Unit of distance.
     type Unit: Number;
-    type Area: Rectangle<Self::Unit>;
+    type Area: Area<Self::Unit> + From<[Self::Unit;4]>;
 
     type HandleInput;
     type Handled;
diff --git a/crates/tek_core/src/engine/collect.rs b/crates/tek_core/src/engine/collect.rs
index 048999a6..5ef3a398 100644
--- a/crates/tek_core/src/engine/collect.rs
+++ b/crates/tek_core/src/engine/collect.rs
@@ -1,15 +1,24 @@
 use crate::*;
 
 pub enum Collected<'a, E: Engine> {
-    Box(Box<dyn Render<E> + 'a>),
-    Ref(&'a (dyn Render<E> + 'a)),
+    Box(Box<dyn Layout<E> + 'a>),
+    Ref(&'a (dyn Layout<E> + 'a)),
 }
 
 impl<'a, E: Engine> Render<E> for Collected<'a, E> {
     fn render (&self, to: &mut E) -> Perhaps<E::Rendered> {
         match self {
-            Self::Box(item) => (*item).render(to),
-            Self::Ref(item) => (*item).render(to),
+            Self::Box(inner) => (*inner).render(to),
+            Self::Ref(inner) => (*inner).render(to),
+        }
+    }
+}
+
+impl<'a, E: Engine> Layout<E> for &Collected<'a, E> {
+    fn layout (&self, area: E::Area) -> Perhaps<E::Area> {
+        match *self {
+            Collected::Box(inner) => (*inner).layout(area),
+            Collected::Ref(inner) => (*inner).layout(area),
         }
     }
 }
@@ -25,9 +34,9 @@ impl<'a, E: Engine> Collection<'a, E> {
 }
 
 pub trait Collect<'a, E: Engine> {
-    fn add_box (self, item: Box<dyn Render<E> + 'a>) -> Self;
-    fn add_ref (self, item: &'a dyn Render<E>) -> Self;
-    fn add <R: Render<E> + Sized + 'a> (self, item: R) -> Self
+    fn add_box (self, item: Box<dyn Layout<E> + 'a>) -> Self;
+    fn add_ref (self, item: &'a dyn Layout<E>) -> Self;
+    fn add <R: Layout<E> + Sized + 'a> (self, item: R) -> Self
         where Self: Sized
     {
         self.add_box(Box::new(item))
@@ -35,11 +44,11 @@ pub trait Collect<'a, E: Engine> {
 }
 
 impl<'a, E: Engine> Collect<'a, E> for Collection<'a, E> {
-    fn add_box (mut self, item: Box<dyn Render<E> + 'a>) -> Self {
+    fn add_box (mut self, item: Box<dyn Layout<E> + 'a>) -> Self {
         self.0.push(Collected::Box(item));
         self
     }
-    fn add_ref (mut self, item: &'a dyn Render<E>) -> Self {
+    fn add_ref (mut self, item: &'a dyn Layout<E>) -> Self {
         self.0.push(Collected::Ref(item));
         self
     }
@@ -54,11 +63,11 @@ impl<'a, E: Engine> Layered<'a, E> {
 }
 
 impl<'a, E: Engine> Collect<'a, E> for Layered<'a, E> {
-    fn add_box (mut self, item: Box<dyn Render<E> + 'a>) -> Self {
+    fn add_box (mut self, item: Box<dyn Layout<E> + 'a>) -> Self {
         self.0 = self.0.add_box(item);
         self
     }
-    fn add_ref (mut self, item: &'a dyn Render<E>) -> Self {
+    fn add_ref (mut self, item: &'a dyn Layout<E>) -> Self {
         self.0 = self.0.add_ref(item);
         self
     }
@@ -103,11 +112,11 @@ impl<'a, E: Engine> Split<'a, E> {
 }
 
 impl<'a, E: Engine> Collect<'a, E> for Split<'a, E> {
-    fn add_box (mut self, item: Box<dyn Render<E> + 'a>) -> Self {
+    fn add_box (mut self, item: Box<dyn Layout<E> + 'a>) -> Self {
         self.items = self.items.add_box(item);
         self
     }
-    fn add_ref (mut self, item: &'a dyn Render<E>) -> Self {
+    fn add_ref (mut self, item: &'a dyn Layout<E>) -> Self {
         self.items = self.items.add_ref(item);
         self
     }
diff --git a/crates/tek_core/src/engine/layout.rs b/crates/tek_core/src/engine/layout.rs
index 5a71693f..a6c8b85e 100644
--- a/crates/tek_core/src/engine/layout.rs
+++ b/crates/tek_core/src/engine/layout.rs
@@ -2,7 +2,7 @@ use crate::*;
 
 /// Trait for structs that compute drawing area before rendering
 pub trait Layout<E: Engine>: Render<E> {
-    fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>>;
+    fn layout (&self, area: E::Area) -> Perhaps<E::Area>;
 }
 /// Enforce minimum size of drawing area
 pub enum Min<U: Number, L> { W(U, L), H(U, L), WH(U, U, L), }
@@ -16,84 +16,84 @@ pub enum Inset<U: Number, L> { W(U, L), H(U, L), WH(U, U, L), }
 pub enum Offset<U: Number, L> { X(U, L), Y(U, L), XY(U, U, L), }
 
 impl<E: Engine, L: Layout<E>> Layout<E> for Min<E:: Unit, L> {
-    fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
+    fn layout (&self, area: E::Area) -> Perhaps<E::Area> {
         match self {
             Self::W(w, item) => if area.w() < *w { Ok(None) } else {
                 // TODO: axis clamp (subtract from x if width goes out of area
-                item.layout([area.x(), area.y(), area.w().max(*w), area.h()])
+                item.layout([area.x(), area.y(), area.w().max(*w), area.h()].into())
             },
             Self::H(h, item) => if area.w() < *h { Ok(None) } else {
                 // TODO: axis clamp (subtract from x if width goes out of area
-                item.layout([area.x(), area.y(), area.w(), area.h().max(*h)])
+                item.layout([area.x(), area.y(), area.w(), area.h().max(*h)].into())
             },
             Self::WH(w, h, item) => if area.w() < *w || area.h() < *h { Ok(None) } else {
-                item.layout([area.x(), area.y(), area.w().max(*w), area.h().max(*h)])
+                item.layout([area.x(), area.y(), area.w().max(*w), area.h().max(*h)].into())
             }
         }
     }
 }
 
 impl<E: Engine, L: Layout<E>> Layout<E> for Max<E:: Unit, L> {
-    fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
+    fn layout (&self, area: E::Area) -> Perhaps<E::Area> {
         match self {
             Self::W(w, item) => {
                 // TODO: axis clamp (subtract from x if width goes out of area
-                item.layout([area.x(), area.y(), area.w().min(*w), area.h()])
+                item.layout([area.x(), area.y(), area.w().min(*w), area.h()].into())
             },
             Self::H(h, item) => {
                 // TODO: axis clamp (subtract from x if width goes out of area
-                item.layout([area.x(), area.y(), area.w(), area.h().min(*h)])
+                item.layout([area.x(), area.y(), area.w(), area.h().min(*h)].into())
             },
             Self::WH(w, h, item) => {
-                item.layout([area.x(), area.y(), area.w().min(*w), area.h().min(*h)])
+                item.layout([area.x(), area.y(), area.w().min(*w), area.h().min(*h)].into())
             }
         }
     }
 }
 
 impl<E: Engine, L: Layout<E>> Layout<E> for Outset<E::Unit, L> {
-    fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
+    fn layout (&self, area: E::Area) -> Perhaps<E::Area> {
         match self {
             Self::W(w, item) => if area.x() < *w { Ok(None) } else {
-                item.layout([area.x() - *w, area.y(), area.w() + *w, area.h()])
+                item.layout([area.x() - *w, area.y(), area.w() + *w, area.h()].into())
             },
             Self::H(h, item) => if area.y() < *h { Ok(None) } else {
-                item.layout([area.x(), area.y() - *h, area.w(), area.h() + *h])
+                item.layout([area.x(), area.y() - *h, area.w(), area.h() + *h].into())
             },
             Self::WH(w, h, item) => if area.x() < *w || area.y() < *h { Ok(None) } else {
-                item.layout([area.x()-*w, area.y() - *h, area.w() + *w, area.h() + *h])
+                item.layout([area.x()-*w, area.y() - *h, area.w() + *w, area.h() + *h].into())
             }
         }
     }
 }
 
 impl<E: Engine, L: Layout<E>> Layout<E> for Inset<E::Unit, L> {
-    fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
+    fn layout (&self, area: E::Area) -> Perhaps<E::Area> {
         match self {
             Self::W(w, item) => if area.w() < *w { Ok(None) } else {
-                item.layout([area.x() + *w, area.y(), area.w() - *w, area.h()])
+                item.layout([area.x() + *w, area.y(), area.w() - *w, area.h()].into())
             },
             Self::H(h, item) => if area.h() < *h { Ok(None) } else {
-                item.layout([area.x(), area.y() + *h, area.w(), area.h() - *h])
+                item.layout([area.x(), area.y() + *h, area.w(), area.h() - *h].into())
             },
             Self::WH(w, h, item) => if area.w() < *w || area.h() < *h { Ok(None) } else {
-                item.layout([area.x() - *w, area.y() - *h, area.w() + *w, area.h() + *h])
+                item.layout([area.x() - *w, area.y() - *h, area.w() + *w, area.h() + *h].into())
             }
         }
     }
 }
 
 impl<E: Engine, L: Layout<E>> Layout<E> for Offset<E::Unit, L> {
-    fn layout (&self, area: impl Rectangle<E::Unit>) -> Perhaps<impl Rectangle<E::Unit>> {
+    fn layout (&self, area: E::Area) -> Perhaps<E::Area> {
         match self {
             Self::X(x, item) => if area.w() < *x { Ok(None) } else {
-                item.layout([area.x() + *x, area.y(), area.w() - *x, area.h()])
+                item.layout([area.x() + *x, area.y(), area.w() - *x, area.h()].into())
             },
             Self::Y(y, item) => if area.h() < *y { Ok(None) } else {
-                item.layout([area.x(), area.y() + *y, area.w(), area.h() - *y])
+                item.layout([area.x(), area.y() + *y, area.w(), area.h() - *y].into())
             },
             Self::XY(x, y, item) => if area.w() < *x || area.h() < *y { Ok(None) } else {
-                item.layout([area.x() + *x, area.y() + *y, area.w() - *x, area.h() - *y])
+                item.layout([area.x() + *x, area.y() + *y, area.w() - *x, area.h() - *y].into())
             }
         }
     }
diff --git a/crates/tek_core/src/space.rs b/crates/tek_core/src/space.rs
index de2c78eb..3cb29743 100644
--- a/crates/tek_core/src/space.rs
+++ b/crates/tek_core/src/space.rs
@@ -29,7 +29,7 @@ impl<N: Number> Point<N> for [N;2] {
     }
 }
 
-pub trait Rectangle<N: Number> {
+pub trait Area<N: Number> {
     fn x (&self) -> N;
     fn y (&self) -> N;
     fn w (&self) -> N;
@@ -42,7 +42,7 @@ pub trait Rectangle<N: Number> {
     }
 }
 
-impl<N: Number> Rectangle<N> for (N, N, N, N) {
+impl<N: Number> Area<N> for (N, N, N, N) {
     fn x (&self) -> N {
         self.0
     }
@@ -57,7 +57,7 @@ impl<N: Number> Rectangle<N> for (N, N, N, N) {
     }
 }
 
-impl<N: Number> Rectangle<N> for [N;4] {
+impl<N: Number> Area<N> for [N;4] {
     fn x (&self) -> N {
         self[0]
     }
diff --git a/crates/tek_core/src/tui.rs b/crates/tek_core/src/tui.rs
index b587f028..dde008e7 100644
--- a/crates/tek_core/src/tui.rs
+++ b/crates/tek_core/src/tui.rs
@@ -224,7 +224,7 @@ pub fn half_block (lower: bool, upper: bool) -> Option<char> {
     }
 }
 
-impl Rectangle<u16> for Rect {
+impl Area<u16> for Rect {
     fn x (&self) -> u16 { self.x }
     fn y (&self) -> u16 { self.y }
     fn w (&self) -> u16 { self.width }
diff --git a/crates/tek_core/src/tui/tui_layout.rs b/crates/tek_core/src/tui/tui_layout.rs
index f82ce793..f09a9485 100644
--- a/crates/tek_core/src/tui/tui_layout.rs
+++ b/crates/tek_core/src/tui/tui_layout.rs
@@ -16,91 +16,43 @@ impl<'a> Render<Tui> for Split<'a, Tui> {
     }
 }
 
+// TODO
 impl<'a> Split<'a, Tui> {
-    pub fn render_areas (&self, to: &mut Tui) -> Usually<(Rect, Vec<Rect>)> {
-        // FIXME very shitty code
-        let Rect { mut x, mut y, mut width, mut height } = to.area();
+    pub fn render_areas (&self, to: &mut Tui) -> Usually<(Rect, Vec<Option<Rect>>)> {
+        let area = to.area();
+        let mut w = 0u16;
+        let mut h = 0u16;
         let mut areas = vec![];
-        match self.direction {
-            Direction::Down  => { width = 0 },
-            Direction::Right => { height = 0 },
-            _ => unimplemented!()
-        }
-        for (index, item) in self.items.0.iter().enumerate() {
-            match self.direction {
-                Direction::Down => { if height == 0 { break } },
-                Direction::Right => { if width == 0 { break } },
-                _ => unimplemented!()
-            }
-            let result = item.render(to.with_area(x, y, width, height))?.unwrap_or(Rect::default());
-            let Rect { width: w, height: h, .. } = result;
-            match self.direction {
-                Direction::Down => {
-                    y += h;
-                    height = height.saturating_sub(h);
-                    width = width.max(w);
-                },
-                Direction::Right => {
-                    x += w;
-                    width = width.saturating_sub(w);
-                    height = height.max(h);
-                },
-                _ => unimplemented!()
-            };
-            areas.push(result);
-            if self.focus == Some(index) {
-                Corners(Style::default().green().not_dim()).draw(to.with_rect(result))?;
-            }
-        }
-        let area = match self.direction {
-            Direction::Down => Rect { x: to.area.x, y: to.area.y, width, height: y },
-            Direction::Right => Rect { x: to.area.x, y: to.area.y, width: x, height },
-            _ => unimplemented!()
-        };
-        //panic!("{:?}", Rect { x: to.area.x, y: to.area.y, width: x, height });
-        Ok((Rect { x, y, width, height }, areas))
+        Ok((match self.direction {
+            Direction::Down => {
+                for component in self.items.0.iter() {
+                    if h >= area.h() {
+                        break
+                    }
+                    let result = Offset::Y(h, component).render(to)?;
+                    areas.push(result);
+                    if let Some(Rect { width, height, .. }) = result {
+                        h += height;
+                        w = w.max(width)
+                    }
+                }
+                Rect { x: area.x(), y: area.y(), width: w, height: h }
+            },
+            Direction::Right => {
+                for component in self.items.0.iter() {
+                    if w >= area.x() {
+                        break
+                    }
+                    let result = Offset::X(w, component).render(to)?;
+                    areas.push(result);
+                    if let Some(Rect { width, height, .. }) = result {
+                        w += width;
+                        h = h.max(height)
+                    }
+                }
+                Rect { x: area.x(), y: area.y(), width: w, height: h }
+            },
+            _ => todo!()
+        }, areas))
     }
 }
-
-// TODO
-//impl<'a> Split<'a, Tui> {
-    //pub fn render_areas (&self, to: &mut Tui)
-        //-> Usually<(Rectangle<Tui>, Vec<Option<Rectangle<Tui>>>)>
-    //{
-        //let area = to.area();
-        //let mut w = 0u16;
-        //let mut h = 0u16;
-        //let mut areas = vec![];
-        //Ok((match self.direction {
-            //Direction::Down => {
-                //for component in self.items.0.iter() {
-                    //if h >= area.h() {
-                        //break
-                    //}
-                    //let result = Offset::Y(h, component).render(to)?;
-                    //areas.push(result);
-                    //if let Some(Rect { width, height, .. }) = result {
-                        //h += height;
-                        //w = w.max(width)
-                    //}
-                //}
-                //(area.x(), area.y(), w, h)
-            //},
-            //Direction::Right => {
-                //for component in self.items.0.iter() {
-                    //if w >= area.x() {
-                        //break
-                    //}
-                    //let result = Offset::X(w, component).render(to)?;
-                    //areas.push(result);
-                    //if let Some(Rect { width, height, .. }) = result {
-                        //w += width;
-                        //h = h.max(height)
-                    //}
-                //}
-                //(area.x(), area.y(), w, h)
-            //},
-            //_ => todo!()
-        //}, areas))
-    //}
-//}