Challenge your self, or your children, with the Tangram ECO Blocks puzzle.  It consists of seven flat pieces, called tan.  The objective of the puzzle is to form a specific shape (given only an outline or silhouette) using all seven pieces, which may not overlap. The shapes can be geometric, people, animals, or things.   Over 6500 different tangram shape-solutions have been created, and the number is ever-growing.  Discover the 13 convex tangram configurations; and be amazed by the tangram paradox shapes. The basic square shape is 8" x 8".  Learning was never so much fun!