The precisely cut geometric shapes offer the child the possibility to explore inscription, concentricity and gradation. The material is contained in a box with lid which has 3 compartments for storage of: a graded set of 6 circles, green on one side and red on the other; a graded set of 6 squares, green on one side and red on the other; 2 graded triangles and 2 graded circles, blue on one side and yellow on the other.