I think I am who you think I am, Jon. I thought much of the efficiency of a ui design you developed.
Adam: I'm happy to participate in abstract (cycloid) related discussions, though travel may not be practical.
I'm about to excavate from under boxes my C64 and see if I can't get the DOGN MOTION routine to produce output. It's natural to suspect a subtlety in my implementation of ADC's effect on the v flag.
Regarding lumia, I remember an effect called, I think, "crystal dimple" (used in Starship, in the Daniel S piece before the rolling "dimple tube" effect came on) that produced an effect like a nebula with material streaming out of an opening in the middle of it. I remember watching the effect being adjusted between shows so the material would flow out of, rather than into, the nebula. I wonder how it worked.