Here's a neat little ANIMATION example.  The GX version is
written in 100% RPL (by Doug Cannon) and the SX version is
written in sys-RPL (by Randall Elton Ding).  The SX version 
will work on a GX as well, and the GX version will just give 
an Undefined XLIB Name when run on an SX (the ANIMATE command 
does not exist on the SX).  The source code for the SX version
is stored under the name 'ANIM.S'

Just run 'GOGX' or 'GOSX' and watch!  Press [+] to make it go 
faster, and [-] to make it go slower.  Press [ON] to exit
the SX version, any other key to exit the GX version.

I always liked the little backflip guy in Duane Blehm's
Stuntcopter game on the Macintosh.  I'd been meaning to grab
the graphics from it and make them into GROBs for a couple
years now, but I lost the game.  I spent an hour this morning
poking around, and I found it again.

These GROBs can be used for anything you wish.

Enjoy!

Doug Cannon