Take hands-on learning to the next level with KEVA Contraptions! Create intricate tunnels, towers, ramps and chutes with this interactive STEM tool! No glue, no connectors, just simple stacking and the laws of gravity. Each Contraptions construction set comes with 200 high-precision KEVA planks and two specially designed bouncy balls that are lightweight for maximum action! As you build, learn the principals of slope, velocity, force, momentum and balance. The "bounce" of the ball provides some of the most surprising moves-make it twist, bump, hop and stop. Projects vary in difficultly, making it suitable for a wide range of ages and abilities. KEVA Contraptions is an inspiration to future engineers, architects and designers and provides an amazing array of creative possibility. Includes a guide book.