Box dimensions: 7 by 6.5 by 2 inches. Each block has a dimension of 6 by 1.5 by 1.5 inches and contains 5 cylinders with knobs.
Language of Blocks in terms of positives, comparatives, and superlatives: Block 1: Thick and Thin Block 2: Large and Small Block 3: Tall and Short Block 4: No language because no dimension is isolated- random sizes.
Purpose: Directly, for visual discrimination of dimensions. Indirectly, as a preparation for writing; coordination of the fingers used to hold the pencil. Refinement of voluntary movement. The child will be able to fit the cylinders with one precise movement. Also, in preparation for mathematics.