*me* Playing around with computers, trying to make some pretty colors happen.
*me, later* I want 18 colors for this, and that's a 54 dimension optimization problem. Oooh, this will be a fun weekend project!
*me, much later* This is proving surprisingly difficult, but it's an interesting problem to think through.
*me, much much later* Yea, this is literally weighted constraint satisfaction... which is NP-hard.