Icehouse pieces, or Icehouse Pyramids, Treehouse pieces, Treehouse Pyramids and officially Looney Pyramids, are nestable and stackable pyramid-shaped gaming pieces and a game system. The game system was invented by Andrew Looney and John Cooper in 1987, originally for use in the game of Icehouse. == History == Andrew Looney in 1987 penned a sci-fi short story, "The Empty City", that included a game called Icehouse, an ancient Martian game. Readers of the short story requested to learn how to play the game. Thus actual rules were invented for Icehouse by Andrew Looney, Kristin Wunderlich (...

Zendo is a game of inductive logic designed by Kory Heath in which one player (the "Master") creates a rule for structures ("koans") to follow, and the other players (the "Students") try to discover it by building and studying various koans which follow or break the rule. The first student to correctly state the rule wins. The game can be played with any set of colorful playing pieces, and has been sold with a set of 60 Icehouse pieces in red, yellow, green, and blue, 60 glass stones and a small deck of cards containing simple rules for beginners. Origami pyramids are a common choice of playing...