The 3 rectangular blocks on the top row represent various sizes from small to big. The 3 round blocks on the left column represent 6 different objects. To play, teacher or parent can use any one of the 3 round blocks and the 3 rectangular blocks, and ask the kid to match the square blocks with the size blocks. Or, to place all 3 rectangular blocks and all round blocks on the board, ask the kid to place all 9 square blocks at the right positions. A perfect toy for object learning, size comparison, size sequencing and logical thinking skills development.