jazzDuncehat 3jul18 based codes by John Dalbec(1993)
and David Eck's glsim.js based jazzSkel 31aug17
by The illiMath Collective, U. Illinois 1989-2018
Press toggles: (b)inoc (s)kin fl(y)/turn (h)omotopy sha(p)e
sliders: {k}ontract gro{j} fly {f}ore {a}ft,
reset: [z]ap