Pentominoes drive puzzle fans wild-and a complete set of these versatile tiles is packaged with every copy of this fun-filled book These 12 unique shapes, each formed by 5 squares joined edge to edge, must be fitted together to match specific patterns-from simple rectangles to animals and people. Eric Harshbarger is a mathematician by education, a computer engineer by trade, and a puzzle wizard by personal choice. His website (www.ericharshbarger.org) features his astounding creations with Lego bricks, among other marvels. Book comes with a full set of plastic pentominoes, making this a great gift