Cycle/toggle (key), hold down {key}, press [key]:
(b)inoc (s)kin fl(y)|(spacebar) (h)omotopy sha(p)e {f}ore {a}ft, [z]ap
Design and C/IrisGL RTICA by Francis, Bourd, Hartmann & Chappell, 1995..1997
Conversion to HTML/WebGL assisted by Reizner, Amanzadeh and Yi "Lisa" Li, 2013..2017
Based on ideas of Pintard, Lawson, Siebenmann, Asimov, and Brehm.