Roomy Town - JigsawTwo beautiful 500 piece jigsaw puzzles from Roxtons. Flower Clock Step into the enchanting world of 18th century botany with this round puzzle inspired by Carl Linnaeus fascinating flower clock theory. Measuring 61cm in diameter, the design features intricate flower illustrations drawn from an 18th century British floriculture book, carefully arranged to reflect Linnaeus concept: flowers opening and closing their petals at precise times of the day.