Keva Contraptions: 200 Plank Set
Challenge kids to take the next step beyond wooden-block buildings and domino chains with the Keva Contraptions: 200 Plank Set. An 18-page idea book guides the way into a Rube Goldberg-esque world of precision stacking to make complex ball ramps. Build tunnels, funnels, ramps and chutes to test rolling balls—and get hands on with the physics of gravity and trajectories. No glue or connectors, just 200 pine planks for simple stacking, and two lightweight balls to take on your tracks. Detailed instructions include how to build the the challenging "Black Hole" and the "Bouncing Plate."