Click for distant view. Or back away ten feet.

SOLOMON W. GOLOMB
pentominoes (print). 10" x 8"
© 2002 Ken Knowlton
detail
A pentomino consists of five squares joined along edges; there are 12. This picture contains 27 of each kind. Since Golomb introduced them in 1953, he has been "committed to their care and feeding." They have led to thousands of puzzles and problems.