The Pig is available in two sizes that 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. The six-layer Pig has a size that enables the child to sit on it while in movement, which enhances not only a child's balance but also the joint senses. Children can lie across them and have the backside of their bodies strengthenend, and children can exercise their arms through the pressure from their own body weight. Fine motor control can be stimulated by putting things into the pig's snout and picking them up again. Launch date: September 2008.