To develop the child's visual perception of three dimensional patterns. Indirectly,to prepare the child for later work in Mathematics ,especially algebra, through the cubes visual representation of the following algebraic formulas: (a+b+c)(a+b+c)(a+b+c) = aaa + 3aab + 3aac + 3abb + 3bbc + 3acc + 3bcc + 6abc + bbb + ccc.

Material: The Trinomial Cube, a larger wooden box with a cover and two adjacent hinged sides, containing twenty-seven wooden blocks, painted in bold enamel colors,that fit together to form a cube with the same pattern on each side and also in the middle (when the cube is opened along any plane). This pattern is a square divided by four off-center lines (two verticle and two horizontal) into three squares (of the different sizes) and six retangles (of three different sizes); the three squares run diagonally, largest to smallest, from one corner of the face to the opposite corner; the largest square is red, the middle square is blue, the smallest square is yellow, and all six rectangles are black.