Yesterday, I was trying--and failing--to give a birds eye view of the Smalltalk meta class stuff. What I really wanted was this graphic I'd seen a while ago that Craig Latta showed me once upon a time. Cool deal. He still has it:

Visualizing the Smalltalk Metalevel.

I think this is one of the neatest pictorals. I like the fusion with the astronomy as well as Craig's musings at the bottom.