Description: a series of 10 prisms of the same length, but varying in width and height. The prisms are made in a constant progression from 1x1x20cm to 10x10x20cm for the largest.
The prisms are made of light-colored, lacquered beechwood, in one piece and without any gluing or assembly, for durability and to enhance the child's concentration.
Direct aim: visual and baryonic discrimination of width and height.
