Judy arrays

[Jeffrey Kegler]

@David:  Thanks for bringing Judy arrays to my attention.  And in fact, they and Marpa seem to be comparable in the sense you state -- achieving results through (alas!) complexity.  I originally wanted Marpa to be simple & elegant, like a late Picasso drawing.  That didn't happen.  But a Hieronymus Bosch is also beautiful, just in a different way.