HAPE ROBOT FACTORY DOMINO SET - Use stored potential energy to catapult a wooden ball into the air with this exciting robot-themed domino set! A tipper car, crazy ball track, tipper arm and series of ramps form an exciting robot production line that you can build again and again. Catapult: The catapult in this clever domino set launches a wooden ball through the air, adding drama and spectacle! Double-sided track. Spinning arm: Momentum travels through the spinning arm and gravity-release arm and into the third ball. Tipper car: Put a wooden ball in the rail car and release it down the ramp. As the car tips over, the ball is released and starts the 'domino effect'. Flag finish box: A finishing flag pops up for a dramatic ending as your last domino falls. STEAM value: The concepts of potential energy, momentum and gravity. Great for developing logical thinking and an understanding of the principles of physics.