> I guess I could add a close-on-stop clauses for programmers
> such as your son but it sounds almost like he's ready to move
> on to racket proper, as in use the Windowing API directly. 

FWIW, despite big-bang’s position as a teaching tool, I much prefer it over 
using the Windowing API directly, considering it provides a pure interface for 
working with real-time graphical applications. I like big-bang’s approach to 
that problem, and I’ve found myself using it many times due to its ease of use. 
In contrast, racket/gui is frustratingly imperative.

> He may also be interested in Jay's variant of 'universe', 
> which is faster (and comes with sound) or Neil's (experimental)
> 3D version. I conjecture that they are both more open to extensions
> than my teaching versions 

I’m aware of pict3d/universe, but I admit I haven’t heard of Jay’s version. Is 
that what lux is? (Either way, it would be nice to get the docs building 
properly on pkg-build, since currently the build fails.)

Anyway, I think it would be nice to have something like 2htdp/universe that’s 
aimed at more experienced programmers. If lux is designed to be that, I’ll 
certainly take a look. Otherwise, would it be worth spending some time figuring 
out how to generalize and scale the ‘universe’ idiom to be a bit more powerful?

Alexis

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