A box with lid consisting of 3 compartments with different shapes: the center compartment contains a graded set of 6 circles with green on one side and red on the other, the left compartment contains a graded set of 6 squares with green on one side and red on the other, and the right compartment containing 2 graded triangles and 2 graded circles with blue on one side and yellow on the other.
This exercise invites the child to understand the concept of gradation.
