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Windows and blocks in different shapes help children to learn basic 3D geometric figures such as cubes and prisms and construct countless shapes with endless imagination. Special design makes stacking and storage secure and efficient. The 5 different types of blocks allow children to explore different shapes and spaces and enhance their creativity. Set includes 8 x Triangles, 8 x Square Windows, 8 x Rectangular Windows, 12 x Square Windows and 20 x Solid Squares.