diff --git a/edn/examples/edn01.rs b/edn/examples/edn01.rs
index ebccfa0f..e8d46b7b 100644
--- a/edn/examples/edn01.rs
+++ b/edn/examples/edn01.rs
@@ -12,7 +12,7 @@ fn main () -> Usually<()> {
 pub struct Example;
 
 impl EdnLayout<Tui> for &Example {
-    fn get_content <'a> (&'a self, sym: &'a str) -> Box<EdnRender<'a, Tui>> {
+    fn get_content <'a> (&'a self, sym: &'a str) -> RenderBox<'a, Tui> {
         Box::new(Thunk::new(move||if sym == ":hello" { "Hello world!" } else { "" }))
     }
 }
diff --git a/edn/examples/edn02.rs b/edn/examples/edn02.rs
index 183f8975..7b15bf64 100644
--- a/edn/examples/edn02.rs
+++ b/edn/examples/edn02.rs
@@ -12,7 +12,7 @@ fn main () -> Usually<()> {
 pub struct Example;
 
 impl EdnLayout<Tui> for &Example {
-    fn get_content <'a> (&'a self, sym: &'a str) -> Box<EdnRender<'a, Tui>> {
+    fn get_content <'a> (&'a self, sym: &'a str) -> RenderBox<'a, Tui> {
         Box::new(Thunk::new(move||if sym == ":hello" { "Hello world!" } else { "" }))
     }
 }
diff --git a/edn/src/edn_view.rs b/edn/src/edn_view.rs
index ecc50407..488b8f3e 100644
--- a/edn/src/edn_view.rs
+++ b/edn/src/edn_view.rs
@@ -1,13 +1,10 @@
 use crate::*;
 use std::marker::PhantomData;
-use ::tek_layout::{*, tek_engine::{Usually, Content, Render, Engine, Thunk}};
+use ::tek_layout::{*, tek_engine::{Usually, Content, Render, RenderBox, Engine, Thunk}};
 use EdnItem::*;
 
-pub type EdnRender<'a, Engine> =
-    dyn Render<Engine> + Send + Sync + 'a;
-
 pub type EdnCallback<'a, Engine, State> =
-    dyn Fn(&'a State)->Box<EdnRender<'a, Engine>> + Send + Sync + 'a;
+    dyn Fn(&'a State)-> RenderBox<'a, Engine> + Send + Sync + 'a;
 
 pub type EdnRenderCallback<'a, Engine, State> =
     Box<EdnCallback<'a, Engine, State>>;
@@ -16,7 +13,7 @@ pub trait EdnLayout<E: Engine> {
     fn get_bool    (&self,    _sym: &str) -> bool { false }
     fn get_unit    (&self,    _sym: &str) -> E::Unit { 0.into() }
     fn get_usize   (&self,    _sym: &str) -> usize { 0 }
-    fn get_content <'a> (&'a self, _sym: &'a str) -> Box<EdnRender<'a, E>> { Box::new(()) }
+    fn get_content <'a> (&'a self, _sym: &'a str) -> RenderBox<'a, E> { Box::new(()) }
 }
 
 /// Renders from EDN source and context.
diff --git a/engine/src/output/content.rs b/engine/src/output/content.rs
index 746dcd28..cfec59c7 100644
--- a/engine/src/output/content.rs
+++ b/engine/src/output/content.rs
@@ -6,12 +6,7 @@ pub trait Content<E: Engine>: Send + Sync + Sized {
     fn layout (&self, area: E::Area) -> E::Area { self.content().layout(area) }
     fn render (&self, output: &mut E::Output) { self.content().render(output) }
 }
-impl<'a, E: Engine> Content<E> for Box<dyn Render<E> + 'a> {
-    fn content (&self) -> impl Render<E> { self }
-}
-impl<'a, E: Engine> Content<E> for Box<dyn Render<E> + Send + Sync + 'a> {
-    fn content (&self) -> impl Render<E> { self }
-}
-impl<E: Engine> Content<E> for &(dyn Render<E> + '_) {
-    fn content (&self) -> impl Render<E> { self }
+impl<E: Engine, C: Content<E>> Render<E> for C {
+    fn layout (&self, area: E::Area) -> E::Area { Content::layout(self, area) }
+    fn render (&self, output: &mut E::Output) { Content::render(self, output) }
 }
diff --git a/engine/src/output/render.rs b/engine/src/output/render.rs
index 5ba5e1dc..1ab02953 100644
--- a/engine/src/output/render.rs
+++ b/engine/src/output/render.rs
@@ -4,9 +4,15 @@ use crate::*;
 pub trait Render<E: Engine>: Send + Sync {
     fn layout (&self, area: E::Area) -> E::Area;
     fn render (&self, output: &mut E::Output);
+    fn boxed <'a> (self) -> RenderBox<'a, E> where Self: Sized + 'a {
+        Box::new(self) as RenderBox<'a, E>
+    }
 }
-
-impl<E: Engine, C: Content<E>> Render<E> for C {
-    fn layout (&self, area: E::Area) -> E::Area { Content::layout(self, area) }
-    fn render (&self, output: &mut E::Output) { Content::render(self, output) }
+pub type RenderDyn<'a, Engine> = dyn Render<Engine> + 'a;
+impl<'a, E: Engine> Content<E> for &RenderDyn<'a, E> where Self: Sized {
+    fn content (&self) -> impl Render<E> { self }
+}
+pub type RenderBox<'a, E: Engine> = Box<RenderDyn<'a, E>>;
+impl<'a, E: Engine> Content<E> for RenderBox<'a, E> {
+    fn content (&self) -> impl Render<E> { self }
 }
diff --git a/src/groovebox.rs b/src/groovebox.rs
index 8f248de0..20c83b4b 100644
--- a/src/groovebox.rs
+++ b/src/groovebox.rs
@@ -76,7 +76,7 @@ impl EdnLayout<Tui> for Groovebox {
             _ => 0
         }
     }
-    fn get_content <'a> (&'a self, item: &str) -> Box<EdnRender<'a, Tui>> {
+    fn get_content <'a> (&'a self, item: &str) -> RenderBox<'a, Tui> {
         use EdnItem::*;
         match item {
             ":input-meter-l" => Box::new(Meter("L/", self.sampler.input_meter[0])),
diff --git a/src/lib.rs b/src/lib.rs
index c39085a4..13b9bc1a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,7 +13,7 @@ pub(crate) use ::tek_tui::{
     tek_engine::{
         from,
         Usually, Perhaps,
-        Output, Content, Render, Thunk, render, Engine, Size, Area,
+        Output, Content, Render, RenderBox, Thunk, render, Engine, Size, Area,
         Input, handle, Handle, command, Command, input_to_command, InputToCommand, keymap, EventMap,
     },
     Tui,