diff --git a/edn/src/edn_view.rs b/edn/src/edn_view.rs
index 488b8f3e..170bef06 100644
--- a/edn/src/edn_view.rs
+++ b/edn/src/edn_view.rs
@@ -35,11 +35,24 @@ impl<E: Engine, T: EdnLayout<E> + Send + Sync> Content<E> for EdnView<E, T> {
     fn content (&self) -> impl Render<E> {
         use EdnItem::*;
         match &self.layout {
-            Nil    => None,
-            Sym(t) => Some(self.context.get_content(t.as_str())),
+            Nil    => ().boxed(),
+            Sym(t) => self.context.get_content(t.as_str()).boxed(),
             Key(t) => panic!("todo: add error handling to content() chain. unexpected key {t}"),
             Num(n) => panic!("todo: add error handling to content() chain. unexpected num {n}"),
-            Exp(e) => todo!("exp {e:?}"),
+            Exp(e) => if let [head, tail @ ..] = e.as_slice() {
+                let head = &head.to_ref();
+                match (head, tail) {
+                    (Key("when"), [Sym(c), Sym(a)]) => When(
+                        self.context.get_bool(c.as_str()),
+                        self.context.get_content(a.as_str())).boxed(),
+                    (Key("bsp/s"), [Sym(a), Sym(b)]) => Bsp::s(
+                        self.context.get_content(a.as_str()),
+                        self.context.get_content(b.as_str())).boxed(),
+                    _ => todo!("{:?} {:?}", &head, &tail)
+                }
+            } else {
+                panic!("todo: add error handling to content() chain. invalid expression {e:?}")
+            },
         }
         //let items = &self.layout;
         //if let (Some(first), rest) = (items.get(0).map(EdnItem::to_str), &items[1..]) {