How did tangram puzzles originate?

Tangram puzzles originated in China during the early 19th century, likely during the Song Dynasty, although their precise origins remain unclear. These puzzles consist of seven flat pieces called tans, which can be arranged to form various shapes and figures. They gained popularity in the West after being introduced to Europe by sailors returning from China. By the 19th century, tangrams became a fashionable pastime in Europe and America, leading to a surge in their popularity as both educational tools and recreational challenges.