This puzzle was described on my Instructables page,http://www.instructables.com/id/A-Diabolical-Puzzle/<but since I've been having such a great time giving these away to strangers, I'm adding it here.The idea is to make the 2 pieces into a pyramid. It can be done, but it's not as easy as you might think. A great ice breaker.Update: AdanA took cymon's comment about cutting the pieces in half and ran with it:http://www.thingiverse.com/thing:29082Exponentially more difficult and more likely to win lunch bets.This reminds me of that movie where a hitchhiker had the idea about doing the guy who invented the "6 Minute Abs" one better by coming up with "5 Minute Abs".Well here's my entry into the multi-pyramid puzzle war... No, it's not 6 pieces, just 4 cut a different way.Suggestion:Print at 10% and fill the parts with sugar when the print is about 3/4 done. The weight of the sugar will keep the parts standing upright, will make a Mariachi sound when they're shaken and if they break... Oh ya.