Matryoshka doll

A matryoshka doll (also called a nesting or babushka doll) is a toy made of wood. It looks like a big doll, but when you open it up, there are smaller dolls inside it, one inside the other, like nesting dolls. The first doll is the largest and each doll inside is a bit smaller than the one before it. When all the dolls are taken apart, the smallest doll is at the center. To put them all back together, you just have to figure out the order that the dolls go in and place them inside one another.