diff --git a/output/src/out_structs.rs b/output/src/out_structs.rs
index c49375f..a68771a 100644
--- a/output/src/out_structs.rs
+++ b/output/src/out_structs.rs
@@ -1,43 +1,36 @@
-#[cfg(test)] use proptest_derive::Arbitrary;
 use crate::*;
 
 /// A point (X, Y).
 ///
 /// ```
-/// let xy = tengri::output::XY(0u16, 0);
+/// let xy: XY<u16> = XY(0, 0);
 /// ```
 #[cfg_attr(test, derive(Arbitrary))]
-#[derive(Copy, Clone, Debug, Default, PartialEq)] pub struct XY<C: Coord>(
-    pub C, pub C
-);
+#[derive(Copy, Clone, Debug, Default)] pub struct XY<C: Coord>(pub C, pub C);
 
 /// A size (Width, Height).
 ///
 /// ```
-/// let wh = tengri::output::WH(0u16, 0);
+/// let wh: WH<u16> = WH(0, 0);
 /// ```
 #[cfg_attr(test, derive(Arbitrary))]
-#[derive(Copy, Clone, Debug, Default, PartialEq)] pub struct WH<C: Coord>(
-    pub C, pub C
-);
+#[derive(Copy, Clone, Debug, Default)] pub struct WH<C: Coord>(pub C, pub C);
 
 /// Point with size.
 ///
 /// ```
-/// let xywh = tengri::output::XYWH(0u16, 0, 0, 0);
+/// let xywh: XYWH<u16> = XYWH(0, 0, 0, 0);
 /// ```
 ///
 /// * [ ] TODO: anchor field (determines at which corner/side is X0 Y0)
 ///
 #[cfg_attr(test, derive(Arbitrary))]
-#[derive(Copy, Clone, Debug, Default, PartialEq)] pub struct XYWH<C: Coord>(
-    pub C, pub C, pub C, pub C
-);
+#[derive(Copy, Clone, Debug, Default)] pub struct XYWH<C: Coord>(pub C, pub C, pub C, pub C);
 
 /// A cardinal direction.
 ///
 /// ```
-/// let direction = tengri::output::Direction::Above;
+/// let direction = Direction::Above;
 /// ```
 #[cfg_attr(test, derive(Arbitrary))]
 #[derive(Copy, Clone, PartialEq, Debug)] pub enum Direction {
@@ -47,7 +40,7 @@ use crate::*;
 /// 9th of area to place.
 /// 
 /// ```
-/// let alignment = tengri::output::Alignment::Center;
+/// let alignment = Align::Center;
 /// ```
 #[cfg_attr(test, derive(Arbitrary))]
 #[derive(Debug, Copy, Clone, Default)] pub enum Alignment {
@@ -57,7 +50,7 @@ use crate::*;
 /// A widget that tracks its rendered width and height.
 ///
 /// ```
-/// let measure = tengri::output::Measure::<tengri::tui::TuiOut>::default();
+/// let measure = Measure::default();
 /// ```
 #[derive(Default)] pub struct Measure<O: Out> {
     pub __: PhantomData<O>,
@@ -68,80 +61,70 @@ use crate::*;
 /// Show an item only when a condition is true.
 ///
 /// ```
-/// fn test () -> impl tengri::output::Draw<tengri::tui::TuiOut> {
-///     tengri::output::when(true, "Yes")
-/// }
+/// let when = When(true, "Yes");
 /// ```
 pub struct When<O, T>(pub bool, pub T, pub PhantomData<O>);
-pub const fn when<O, T>(condition: bool, content: T) -> When<O, T> {
-    When(condition, content, PhantomData)
-}
 
 /// Show one item if a condition is true and another if the condition is false.
 ///
 /// ```
-/// fn test () -> impl tengri::output::Draw<tengri::tui::TuiOut> {
-///     tengri::output::either(true, "Yes", "No")
-/// }
+/// let either = Either(true, "Yes", "No");
 /// ```
-pub struct Either<E, A, B>(pub bool, pub A, pub B, pub PhantomData<E>);
-pub const fn either<E, A, B>(condition: bool, content_a: A, content_b: B) -> Either<E, A, B> {
-    Either(condition, content_a, content_b, PhantomData)
-}
+pub struct Either<E: Out, A, B>(pub bool, pub A, pub B, pub PhantomData<E>);
 
 /// Increment X and/or Y coordinate.
 ///
 /// ```
-/// let pushed = tengri::output::Push::XY(2, 2, "Hello");
+/// let pushed = Push::XY(2, 2, "Hello");
 /// ```
 pub enum Push<U, A> { X(U, A), Y(U, A), XY(U, U, A), }
 
 /// Decrement X and/or Y coordinate.
 ///
 /// ```
-/// let pulled = tengri::output::Pull::XY(2, 2, "Hello");
+/// let pulled = Pull::XY(2, 2, "Hello");
 /// ```
 pub enum Pull<U, A> { X(U, A), Y(U, A), XY(U, U, A), }
 
 /// Set the content to fill the container.
 ///
 /// ```
-/// let filled = tengri::output::Fill::XY("Hello");
+/// let filled = Fill::XY("Hello");
 /// ```
 pub enum Fill<A> { X(A), Y(A), XY(A) }
 
 /// Set fixed size for content.
 ///
 /// ```
-/// let fixed = tengri::output::Fixed::XY(3, 5, "Hello"); // 3x5
+/// let fixed = Fixed::XY(3, 5, "Hello"); // 3x5
 /// ```
 pub enum Fixed<U, A> { X(U, A), Y(U, A), XY(U, U, A), }
 
 /// Set the maximum width and/or height of the content.
 ///
 /// ```
-/// let maximum = tengri::output::Min::XY(3, 5, "Hello"); // 3x1
+/// let maximum = Min::XY(3, 5, "Hello"); // 3x1
 /// ```
 pub enum Max<U, A> { X(U, A), Y(U, A), XY(U, U, A), }
 
 /// Set the minimum width and/or height of the content.
 ///
 /// ```
-/// let minimam = tengri::output::Min::XY(3, 5, "Hello"); // 5x5
+/// let minimam = Min::XY(3, 5, "Hello"); // 5x5
 /// ```
 pub enum Min<U, A> { X(U, A), Y(U, A), XY(U, U, A), }
 
 /// Decrease the width and/or height of the content.
 ///
 /// ```
-/// let shrunk = tengri::output::Shrink::XY(2, 0, "Hello"); // 1x1
+/// let shrunk = Shrink::XY(2, 0, "Hello"); // 1x1
 /// ```
 pub enum Shrink<U, A> { X(U, A), Y(U, A), XY(U, U, A), }
 
 /// Increaase the width and/or height of the content.
 ///
 /// ```
-/// let expanded = tengri::output::Expand::XY(5, 3, "HELLO"); // 15x3
+/// let expanded = Expand::XY(5, 3, "HELLO"); // 15x3
 /// ```
 pub enum Expand<U, A> { X(U, A), Y(U, A), XY(U, U, A), }
 
@@ -151,9 +134,9 @@ pub enum Expand<U, A> { X(U, A), Y(U, A), XY(U, U, A), }
 /// ```
 /// use ::tengri::{output::*, tui::*};
 /// let area = XYWH(10u16, 10, 20, 20);
-/// fn test (area: XYWH<u16>, item: &impl Draw<TuiOut>, expected: [u16;4]) {
-///     //assert_eq!(Lay::layout(item, area), expected);
-///     //assert_eq!(Draw::layout(item, area),  expected);
+/// fn test (area: XYWH<16>, item: &impl Draw<TuiOut>, expected: [u16;4]) {
+///     assert_eq!(Content::layout(item, area), expected);
+///     assert_eq!(Draw::layout(item, area),  expected);
 /// };
 ///
 /// let four = ||Fixed::XY(4, 4, "");
@@ -184,17 +167,14 @@ pub enum Pad<U, A> { X(U, A), Y(U, A), XY(U, U, A), }
 /// TODO DOCUMENTME
 ///
 /// ```
-/// use tengri::output::{Bounded, XYWH};
-/// let area = XYWH(0, 0, 0, 0);
-/// let content = "";
-/// let bounded: Bounded<tengri::tui::TuiOut, _> = Bounded(area, content);
+/// let bounded = Bounded(XYWH(0, 0, 0, 0), "");
 /// ```
 pub struct Bounded<O: Out, D>(pub XYWH<O::Unit>, pub D);
 
 /// Draws items from an iterator.
 ///
 /// ```
-/// // FIXME let map = tengri::output::Map(||[].iter(), |_|{});
+/// let map = Map(||[].iter(), |_|{});
 /// ```
 pub struct Map<O, A, B, I, F, G>
 where
diff --git a/output/src/out_tests.rs b/output/src/out_tests.rs
index 72bdabe..784f0a1 100644
--- a/output/src/out_tests.rs
+++ b/output/src/out_tests.rs
@@ -3,7 +3,7 @@ use proptest_derive::Arbitrary;
 use crate::*;
 
 #[test] fn test_area () {
-    assert_eq!(XYWH(10u16, 10, 20, 20).center(), XY(20, 20));
+    assert_eq!(Area::center(&[10u16, 10, 20, 20]), [20, 20]);
 }
 
 proptest! {
@@ -19,7 +19,7 @@ proptest! {
         h in u16::MIN..u16::MAX,
         a in u16::MIN..u16::MAX,
     ) {
-        let _ = d.split_fixed(XYWH(x, y, w, h), a);
+        let _ = d.split_fixed([x, y, w, h], a);
     }
 }
 
@@ -32,27 +32,27 @@ proptest! {
         a in u16::MIN..u16::MAX,
         b in u16::MIN..u16::MAX,
     ) {
-        let _: XYWH<u16> = XYWH::zero();
-        //let _: XYWH<u16> = XYWH::from_position([a, b]);
-        //let _: XYWH<u16> = XYWH::from_size([a, b]);
-        let area: XYWH<u16> = XYWH(x, y, w, h);
-        //let _ = area.expect_min(a, b);
+        let _: [u16;4] = <[u16;4] as Area<u16>>::zero();
+        let _: [u16;4] = <[u16;4] as Area<u16>>::from_position([a, b]);
+        let _: [u16;4] = <[u16;4] as Area<u16>>::from_size([a, b]);
+        let area: [u16;4] = [x, y, w, h];
+        let _ = area.expect_min(a, b);
         let _ = area.xy();
         let _ = area.wh();
-        //let _ = area.xywh();
-        let _ = area.clipped_h(a);
-        let _ = area.clipped_w(b);
-        let _ = area.clipped(WH(a, b));
-        //let _ = area.set_w(a);
-        //let _ = area.set_h(b);
+        let _ = area.xywh();
+        let _ = area.clip_h(a);
+        let _ = area.clip_w(b);
+        let _ = area.clip([a, b]);
+        let _ = area.set_w(a);
+        let _ = area.set_h(b);
         let _ = area.x2();
         let _ = area.y2();
         let _ = area.lrtb();
         let _ = area.center();
+        let _ = area.center_x(a);
+        let _ = area.center_y(b);
+        let _ = area.center_xy([a, b]);
         let _ = area.centered();
-        let _ = area.centered_x(a);
-        let _ = area.centered_y(b);
-        let _ = area.centered_xy([a, b]);
     }
 }
 
@@ -63,15 +63,15 @@ proptest! {
         a in u16::MIN..u16::MAX,
         b in u16::MIN..u16::MAX,
     ) {
-        let size = WH(x, y);
+        let size = [x, y];
         let _ = size.w();
         let _ = size.h();
         let _ = size.wh();
         let _ = size.clip_w(a);
         let _ = size.clip_h(b);
-        //let _ = size.expect_min(a, b);
-        //let _ = size.to_area_pos();
-        //let _ = size.to_area_size();
+        let _ = size.expect_min(a, b);
+        let _ = size.to_area_pos();
+        let _ = size.to_area_size();
     }
 }
 
diff --git a/output/src/out_traits.rs b/output/src/out_traits.rs
index 9c7ec49..2d81030 100644
--- a/output/src/out_traits.rs
+++ b/output/src/out_traits.rs
@@ -3,12 +3,18 @@ use crate::*;
 /// Drawing target.
 ///
 /// ```
-/// use tengri::output::*;
-/// struct TestOut(XYWH<u16>);
+/// use crate::*;
+/// struct TestOut([u16;4]);
 /// impl Out for TestOut {
 ///     type Unit = u16;
-///     fn area (&self) -> XYWH<u16> { self.0 }
-///     fn area_mut (&mut self) -> &mut XYWH<u16> { &mut self.0 }
+///     type Size = [u16;2];
+///     type Area = [u16;4];
+///     fn area (&self) -> [u16;4] {
+///         self.0
+///     }
+///     fn area_mut (&mut self) -> &mut [u16;4] {
+///         &mut self.0
+///     }
 ///     fn place_at <T: Draw<Self> + ?Sized> (&mut self, area: XYWH<u16>, _: &T) {
 ///         println!("place_at: {area:?}");
 ///         ()
@@ -16,7 +22,7 @@ use crate::*;
 /// }
 /// impl Draw<TestOut> for String {
 ///     fn draw (&self, to: &mut TestOut) {
-///         //to.area_mut().set_w(self.len() as u16);
+///         to.area_mut().set_w(self.len() as u16);
 ///     }
 /// }
 /// ```
diff --git a/tui/src/lib.rs b/tui/src/lib.rs
index 8e5aa42..6b3a34e 100644
--- a/tui/src/lib.rs
+++ b/tui/src/lib.rs
@@ -1,16 +1,23 @@
 #![feature(type_changing_struct_update, trait_alias)]
-pub extern crate dizzle;
-pub extern crate tengri_input;
-pub extern crate tengri_output;
-pub extern crate ratatui;
-pub extern crate crossterm;
-pub extern crate palette;
-pub extern crate better_panic;
-pub use ::tengri_output::PerfModel;
+
 use std::{time::Duration, thread::{spawn, JoinHandle}, io::Write};
 use unicode_width::*;
+
+pub use ::{
+    dizzle,
+    tengri_input,
+    tengri_output::{self, PerfModel},
+    ratatui,
+    crossterm,
+    palette,
+    better_panic,
+};
+
 pub(crate) use ::{
-    dizzle::*, tengri_input::*, tengri_output::*,
+    dizzle::*,
+    tengri_input::*,
+    tengri_output::*,
+    atomic_float::AtomicF64,
     std::{io::{stdout, Stdout}, sync::{Arc, RwLock, atomic::{AtomicBool, Ordering::*}}},
     better_panic::{Settings, Verbosity},
     palette::{*, convert::*, okhsl::*},
@@ -31,7 +38,8 @@ pub(crate) use ::{
 #[macro_export] macro_rules! tui_main {
     ($expr:expr) => {
         fn main () -> Usually<()> {
-            tengri_tui::Tui::run(true, $expr)?;
+            let state = Arc::new(RwLock::new($expr));
+            tengri_tui::Tui::new().unwrap().run(&state)?;
             Ok(())
         }
     };
@@ -72,14 +80,12 @@ macro_rules! border {
     )+}
 }
 
-mod tui_structs; pub use self::tui_structs::*;
-mod tui_traits;  pub use self::tui_traits::*;
-mod tui_impls;
-#[cfg(test)] mod tui_test;
+mod tui_structs;  pub use self::tui_structs::*;
+mod tui_traits;   pub use self::tui_traits::*;
+mod tui_impls;    pub use self::tui_impls::*;
 
 /// Run an app in the main loop.
 pub fn tui_run <T: Send + Sync + Draw<TuiOut> + Handle<TuiIn> + 'static> (
-    join: bool,
     state: &Arc<RwLock<T>>
 ) -> Usually<Arc<RwLock<Tui>>> {
     let backend = CrosstermBackend::new(stdout());
@@ -94,17 +100,15 @@ pub fn tui_run <T: Send + Sync + Draw<TuiOut> + Handle<TuiIn> + 'static> (
     let _input_thread = tui_input(tui.clone(), state, Duration::from_millis(100));
     tui.write().unwrap().setup()?;
     let render_thread = tui_output(tui.clone(), state, Duration::from_millis(10))?;
-    if join {
-        match render_thread.join() {
-            Ok(result) => {
-                tui.write().unwrap().teardown()?;
-                println!("\n\rRan successfully: {result:?}\n\r");
-            },
-            Err(error) => {
-                tui.write().unwrap().teardown()?;
-                panic!("\n\rDraw thread failed: error={error:?}.\n\r")
-            },
-        }
+    match render_thread.join() {
+        Ok(result) => {
+            tui.write().unwrap().teardown()?;
+            println!("\n\rRan successfully: {result:?}\n\r");
+        },
+        Err(error) => {
+            tui.write().unwrap().teardown()?;
+            panic!("\n\rDraw thread failed: error={error:?}.\n\r")
+        },
     }
     Ok(tui)
 }
@@ -488,3 +492,41 @@ pub(crate) fn width_chars_max (max: u16, text: impl AsRef<str>) -> u16 {
     }
     return width
 }
+
+#[cfg(test)] mod tui_test {
+    use crate::*;
+    #[test] fn test_tui_engine () -> Usually<()> {
+        //use std::sync::{Arc, RwLock};
+        struct TestComponent(String);
+        impl HasContent<TuiOut> for TestComponent {
+            fn content (&self) -> impl Content<TuiOut> {
+                Some(self.0.as_str())
+            }
+        }
+        impl Handle<TuiIn> for TestComponent {
+            fn handle (&mut self, _from: &TuiIn) -> Perhaps<bool> {
+                Ok(None)
+            }
+        }
+        let engine = Tui::new()?;
+        engine.read().unwrap().exited.store(true, std::sync::atomic::Ordering::Relaxed);
+        let state = TestComponent("hello world".into());
+        let _state = std::sync::Arc::new(std::sync::RwLock::new(state));
+        //engine.run(&state)?;
+        Ok(())
+    }
+    //#[test] fn test_parse_key () {
+        ////use KeyModifiers as Mods;
+        //let _test = |x: &str, y|assert_eq!(KeyMatcher::new(x).build(), Some(Event::Key(y)));
+        ////test(":x",
+            ////KeyEvent::new(KeyCode::Char('x'), Mods::NONE));
+        ////test(":ctrl-x",
+            ////KeyEvent::new(KeyCode::Char('x'), Mods::CONTROL));
+        ////test(":alt-x",
+            ////KeyEvent::new(KeyCode::Char('x'), Mods::ALT));
+        ////test(":shift-x",
+            ////KeyEvent::new(KeyCode::Char('x'), Mods::SHIFT));
+        ////test(":ctrl-alt-shift-x",
+            ////KeyEvent::new(KeyCode::Char('x'), Mods::CONTROL | Mods::ALT | Mods::SHIFT ));
+    //}
+}
diff --git a/tui/src/tui_impls.rs b/tui/src/tui_impls.rs
index 5fc0198..20b3410 100644
--- a/tui/src/tui_impls.rs
+++ b/tui/src/tui_impls.rs
@@ -4,10 +4,10 @@ use rand::{thread_rng, distributions::uniform::UniformSampler};
 
 impl Tui {
     /// Create and launch a terminal user interface.
-    pub fn run <T> (join: bool, state: T) -> Usually<Arc<RwLock<Self>>> where
-        T: Handle<TuiIn> + Draw<TuiOut> + Send + Sync + 'static
-    {
-        tui_run(join, &Arc::new(RwLock::new(state)))
+    pub fn run <T: Send + Sync + Handle<TuiIn> + Draw<TuiOut> + 'static> (
+        state: &Arc<RwLock<T>>
+    ) -> Usually<Arc<RwLock<Self>>> {
+        tui_run(state)
     }
     /// True if done
     pub fn exited (&self) -> bool { self.exited.fetch_and(true, Relaxed) }
diff --git a/tui/src/tui_test.rs b/tui/src/tui_test.rs
index 0d8a1f7..e69de29 100644
--- a/tui/src/tui_test.rs
+++ b/tui/src/tui_test.rs
@@ -1,34 +0,0 @@
-use crate::*;
-
-#[test] fn test_tui_engine () -> Usually<()> {
-    //use std::sync::{Arc, RwLock};
-    struct TestComponent(String);
-    impl Draw<TuiOut> for TestComponent {
-        fn draw (&self, _to: &mut TuiOut) {
-        }
-    }
-    impl Handle<TuiIn> for TestComponent {
-        fn handle (&mut self, _from: &TuiIn) -> Perhaps<bool> {
-            Ok(None)
-        }
-    }
-    let engine = Tui::run(false, TestComponent("hello world".into()))?;
-    engine.read().unwrap().exited.store(true, std::sync::atomic::Ordering::Relaxed);
-    //engine.run(&state)?;
-    Ok(())
-}
-
-//#[test] fn test_parse_key () {
-    ////use KeyModifiers as Mods;
-    //let _test = |x: &str, y|assert_eq!(KeyMatcher::new(x).build(), Some(Event::Key(y)));
-    ////test(":x",
-        ////KeyEvent::new(KeyCode::Char('x'), Mods::NONE));
-    ////test(":ctrl-x",
-        ////KeyEvent::new(KeyCode::Char('x'), Mods::CONTROL));
-    ////test(":alt-x",
-        ////KeyEvent::new(KeyCode::Char('x'), Mods::ALT));
-    ////test(":shift-x",
-        ////KeyEvent::new(KeyCode::Char('x'), Mods::SHIFT));
-    ////test(":ctrl-alt-shift-x",
-        ////KeyEvent::new(KeyCode::Char('x'), Mods::CONTROL | Mods::ALT | Mods::SHIFT ));
-//}