Fisher-Price Little People

In the 1960s, toy company Fisher-Price began producing its popular line of Fisher-Price Little People -- small figures of people and dogs with cylindrical bodies, who fit into specially made vehicles and buildings. The first Little People set was a school bus, with human characters who fit inside, "sitting" in circular holes. The original Little People figures were made of wood, with plastic vehicles and buildings; later, the figures would be made of plastic as well. The Little People toys were an instant success, and the school bus was soon followed by more sets.

Fisher-Price produced a Sesame Street line of Little People between 1974 and 1977, with two building sets and 16 characters.