Introduction -- Raw materials -- Making squares -- Crowns & towers game -- Jumping frogs -- Scoopy ball game -- Flap cube cores & paneled cubes -- Photo cubes -- Modular chess & checkerboard sets -- Ali's folded dish -- Masu boxes -- Star box lids -- Candy wrapper butterflies -- Interlocking flower petals -- Sailboat envelopes -- Flapping bird envelopes -- Shuttle darts -- Art-deco wings -- Snack bag wallets -- Big ballot boxes -- Custom-bound books -- Calendar wreaths -- Curler unit balls -- Paper hearts -- Crumpled mushrooms -- Pinwheel envelopes -- Dave Brill's origami masu -- Suggested uses for trash origami.