Blendies Pre-K-5th Explore symmetry, balance, and optical color mixing with rebuildable spinning tops. From $4.88 Flying Machines K-5th Build reusable high-flying machines and explore energy transfer, aerodynamics, and flight. From $4.20 Wind-Up Vehicles 2nd-5th Design and build vehicles that zoom using a spring-driven motor and stored energy. From $4.20 Crankie Contraptions 1st-5th Tell an illustrated story using a cardboard scrolling machine. From $4.88 Art Machines Pre-K-3rd Build kinetic creatures from levers and fulcra that come to life when their parts move together. From $4.20 Eyelusions K-5th Build a motorized thaumatrope, design image pairs, and discover how motion can fool the eye. From $4.88 Monster Claws 4th-5th Build an air-powered claw that opens, closes, picks up, and lets go. From $4.88 Scene Machines 3rd-5th Create hand-powered automata that use rotational motion to animate a scene. From $4.20 Mazes Pre-K-5th Build ramps and pathways that guide a ball to its goal, then connect mazes together. From $4.88 Hypnotizers 2nd-5th Draw colorful spirals with a spring-driven machine that creates different designs every time. From $4.88 Monster Mouths Pre-K-3rd Create playful air-powered creatures that move with pistons, cylinders, and air pressure. From $4.20 Drawbots 3rd-5th Build whimsical machines that move, scribble, and draw through vibration and iteration. From $4.88 Screen Machines K-5th Plan and bring illustrated stories to life by building a cardboard scrolling machine. From $4.20 Straw Structures Pre-K-5th Engineer rebuildable structures with paper tubes, flexible connectors, geometry, and open-ended design. From $4.88 Linkages Pre-K-5th Invent moving cardboard contraptions using systems of levers, fulcra, and linkages. From $4.88 Strawbots 2nd-5th Explore balanced and unbalanced forces in a motorized wiggling machine. From $4.88 Electric Vehicles 3rd-5th Design, build, and test battery-powered vehicles using motors and simple circuits. From $4.88