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 -> # Concept Design
 
+->  ## Lisp
+
+- simple in terms of syntax
+- expressive
+- very different from JavaScript
+
+---
+
+-> # Concept Design
+
+-> ## zepto
+
+- Good grasp on the language and implementation details
+- simple Scheme, yet feature-complete
+- Haskell implementation lends itself well to cross-compilation
+- small code size ensures small JavaScript compilate
+
+---
+
+-> # Concept Design
+
+-> ## Macros & Continuations
+
+- features handy, but not present in JavaScript
+- serve as a benchmark for the compiler
+
+---
+
+-> # Concept Design
+
+-> # Ecosystem
+
+- the module system
+  - ensures identifier uniqueness through namespaces
+- standard library
+  - extensive, general-purpose library
+- zeps
+  - modern package manager
+
 ---
 
 -> # System Design