"It's like going from a small jigsaw puzzle to a bigger one," Parmenier says, though the progression feels so smooth that the increasing complexity remains almost unnoticeable. The story behind DarZal ...

He used a marquetry, or jigsaw, hence the name “jigsaw puzzle” still in use today. The resulting pieces could then be used to teach geography in a very effective way. For the most part, puzzles ...