The Fish are available in two sizes and they can be stacked. The low one is for the child who has just learned to sit. The big one is for the older child, and once you stack them, they fit teenagers and grown-ups. It is nice to have an example of each animal, because the child grows along with them, and as a result they can be used over a long period of time. You can roll the animal to one another, or roll and chase it. The 6-layer Fish has a size that enables the child to sit on it while in movement, which enhance not only the balance but also the joint senses. Children can lie across them and have the backside of their bodies strengthened, and children can exercise their arms through the pressure from their own body weight.
