Outline:

PyPy Overview:
  - goals, ideas
    - a toolkit for writing interpreters
    - interpreters written in a high-level language
    - abstracting away low-level aspects
    - various target environments
    - sort of model-driven approach
  - translation aspects
    - GC
    - object model details (e.g. exact memory layout, tagged pointers)
    - target environment

Big ideas:
  - abstract over low-level details
  - compile-time meta-programming
  - shadows

SPy:
  - Interpreter
  - Object Model: typical squeak object model + specific classes (which will
    be replaced by shadows) + no tagged pointers
  - Shadows
    - Caching of interpreter-internal information
    - Abstraction (Perfect place to put smalltalk-class-specific methods)
  - Primitives: explain expose_primitive
  - Image Loading very quickly

Sprint
  - Squeak people don't know anything about Py(Py/thon)
  - PyPy people don't know anything about Squeak
  -> But it still works out

Results:
  - no gc, no jit etc. all is "for free"
     - woven in by pypy
  - small and understandable, clean implementation
     - made smaller by compile-time metaprogramming
  - quick performance (+ source size) discussion