Jigsaw puzzle

While jigsaw puzzles for adults take many shapes, those for children are often held within a "frame," to make them a little easier to assemble and to keep them together when stored with other playthings. And, frame puzzles are among the first educational toys given to toddlers. They help develop spacial and color recognition, as well as hand-eye coordination. With the growth of the use of plastics in the toy industry after the middle of the 20th century, some firms created toddlers' puzzles within plastic frame. The puzzles themselves are the more standard cardboard, while their pieces are large enough for children's hands to grasp.