The 3 differently shaped pieces on this board include a triangle, square and circle in red, yellow and blue. Each piece exists in three sizes and being hollow these can be carefully stacked on top of each other to form a small tower. In addition, the board has recesses which exactly accommodate each shape. Pieces can therefore be used with or without the board in a variety of stacking, placing, matching sorting and naming games. A very versatile, engaging and stimulating resource.