revised 16feb22, 11feb22
Brief guide controlling the RTICAs 

The operating instructions displayed within the dunce7.html RTICA 
reads as follows
====================================================================
Click me st(o)p morp(h) (b)inoc sha(p)e (f)ore (a)ft fl(y) (z)ap
jazzDuncehat 23oct18, 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: st(o)p morp(h) (b)inoc (s)kin fl(y)/turn morp(h) sha(p)e
repeaters: {k}ontract {j}expand {f}ore {a}ft
reset: [z]ap
=====================================================================
and is explained in greater detail here.

The mnemonic button labels indicate their keyboard counterpart inside ().
All buttons and keys do something visible in the RTICA. So keep the RTICA
 open as you read this document.

[st(o)p] toggles the rotator based on last mouse position or finger tap.
 
[morph(h)] toggles the "teaser" animation. 

[(b)inoc] toggles the cross-eyed stereo pairs.

[sha(p)e] cycles through additional variants of the main surface.

[(f)ore] flies camera forward, in lieu of the traditional 3-button mouse.

[(a)ft]  flies backward. Hold these repeaters keys and steer with mouse,
or tap at a new position on a mouseless device.

[fl(y)] toggles fly/turn mode of moused rotation center: user/object 

[(z)ap] resets state parameters to initial values, but not navigation. 
To start over from the beginning refresh refresh your browser.

On a computer, the mouse rotator is "second order", like the rudder of a 
boat rather than the steering wheel of a car. The angular velocity depends
on the distance of the mouse from the center of the screen. The direction
from the center to the mouse is the axis of rotation in the xy-plane of the 
screen (yaw and pitch, no roll). On a device (phone, pad, etc) the position 
of the "mouse" is indicated by a finger tap on the touch screen.

Keys may function as switches, toggles, cyclers, and "sliders". You can 
discover which by experimentation. Some keys in some RTICA accept a shift 
modifier which reversed the action. Thus the pair of repeater keys
(f)ore and (a)ft might be replaced by (f) and (shift)+(f). 

Some RTICAs have cyclers on the 2^n numbers 0,1,2,...,(2^n-1) and flip 
n toggles according to the n bits of their binary expansion. Thus a 
single key can run through all combinations of the toggles.