In her new book The Design of Childhood: How the Material World Shapes Independent Kids, architecture critic Alexandra Lange explains that since the dawn of the mass-produced toy industry, there have been Good Toys and Bad Toys in the eyes of adults.

"The Bad Toy is one that just sits there, to be mashed and pulled in a set sequence, and is ruined once it falls apart," she writes. "The Good Toy lets children stitch their own world back together, using the simplest of physical parts to conjure cities of imagination."