Someone, most likely Joe, introduced this game to a few of us a couple of years ago. I just thought about it again today and searched for it on Google.
The point is that you have to use mirrors and prisms to get a laser beam to light up some lights. Be warned, it is addictive. Also be warned, you will spend at least at least an hour trying to beat level 17. If I remember correctly, the only person who was able to beat level 17 when I first played this was Dabney. If I didn't steal his solution I would never have figured it out. Play the game, so long as you have a couple hours free.