Thanks for this link to Concrete Abstractions. It looks great. I downloaded
the pdf and plan to explore it.

Yes, I'd like to build a Cobalt world. That sounds like a good idea. I
figure that's where the active development is, and I should be. But I made a
few inroads with Croquet and just sort of played around with it more. I'll
email you tomorrow. At the moment it's Friday night and I need to turn off
my brain.

Chris
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