Giant Polydron Gear Set 58 PiecesGear up for big builds and bigger thinking with the Giant Polydron Gear Set 58 Pieces. This hands on, interactive construction set combines the classic Polydron building system with working gears, allowing children to explore the fundamentals of motion, mechanics, and cause and effect through open ended play. Children can build large scale vertical or horizontal panels using oversized squares and triangles, then attach the gears to watch a chain