I love Schoenhut Circus props--those classic white chairs, and primary color stands made for lion tamers and the like--but I'd never seen platforms like these before. Great things. Good as small pedestals for other things, but also very satisfying arranged as minimalist architectural constructions. And I love that printed in old black marker on the underside of one of them is "Barbie."  

Each 3 3/4" x 3" x 3". Set of 4. Early 20th century. Some variation in wear/aging to the white paint, and one of the four slightly different than the other three (no nails at tops of legs.)