Tangrams - a Chinese visual game
"The tangram is a dissection puzzle (of Chinese origin) consisting of seven flat shapes, called tans, which are put together to form shapes. The objective of the puzzle is to form a specific shape (given only in outline or silhouette) using all seven pieces, which may not overlap." "An estimate of ten million possible configurations has been offered..." Source: Wikipedia The practice can be very challenging. It develops visual thinking and problem solving - try it. Link Wiki Link Tangram Challenges Online Link All Things Tangram - History, Sets, and Online Games