The X GEO geometric shapes are easy to assemble and disassemble using Gigo's unique hinge. Each geo shape has a smaller hole in the center helps young hands to hold the pieces, assists with shape recognition, and allows for tracing games. Follow the exercises on the 10 activity cards to transform 2D nets into 3D shapes. With so many pieces, children will be able to have fun building prisms, pyramids, Platonic Solids and Archimedean Solids next to each other so they can observe, compare and discuss them afterward.