It's based off the LEG from the game "Turing Complete."

The program I wrote is made using customasm. It took over 2 minutes to run. Here it is:
#include "defs.casm"
disp clear
disp refresh
mv 0 r1
loopY:
mv 0 r0
loopX:
or r0 0x70 r2 ; Setting the upper nibble sets the red.
disp rgb r2 r1
disp put r0 r1
disp refresh
inc r0
jmp to loopX if r0 lt 16
inc r1
jmp to loopY if r1 lt 16
halt

