These demos run only on SGI machines and require the 'gl' built-in module.
The demonstrate the abilities of SGI's GL library as well as the ease of
GL programming in Python. Most demos require the Z-buffer (aka
24-bitplane) option.

backface Demonstrates the 'backface' GL function.

kites Show 3 flying kites. Demonstrates the rendering speed
 obtainable by Python programs.

mclock A colorful clock with more options than you can
 remember. Works on 8-bit machines (but allows more
 colors on 24-bit machines).

mixing Demonstrates the effect of color mixing: through
 frequent color switching it gives the effect of white
 light.

nurbs A simple demonstration of the 'nurbs' GL functions.

zrgb Displays a 3-D Gouraud-shaded figure which can be moved
 around with the mouse.