Montessori Geometric Solids With Stands, Bases, and Box The purpose of this material is to develop the childs stereognostic sense, which creates a mental picture through touch. To help make the child more awake of the basic shapes found in the cultural environment. Indirectly, to prepare the child for later work in Mathehmatics, especially geometry, by identifying solid shapes and exploring the relationships between their plane and curved surfaces Box size : 21 x 15 x 5.5 cm