Launch into a grand space adventure! Use the 9-piece Geometric Mortise & Tenon Cube for boundless Tangram-style creations. This set centers on the cylinder shape, allowing various combinations of thick and thin cylinders to build 8 different spacecraft, including a Space Station, Shuttle, Rocket, and Satellite. The durable M&T structure ensures uninterrupted, immersive play. Features extensive geometric and creative learning content. Comes with a Mystery Letter to ignite the child’s curiosity and desire for cosmic exploration.