Sort, stack, build, tear down and start over! This stackable pyramid of 10 cubes of different sizes will help them learn to organize pieces by size and color and become familiar with the concepts of big and small. It is perfect for developing your mathematical thinking at a very early age. In addition to its cute animal illustrations, each cube has a number (1-10) so you can start to familiarize yourself with these concepts. A very complete toy that also stimulates your concentration and hand-eye coordination.