Look twice: sometimes what you think you're seeing isn't there at all. This deck of 55-cards is an eye-catching collection of optical illusions that fool the eye and delight the imagination. Created by Pentagram, based on the best-selling book Pentamagic (Simon & Schuster). Packaged in a colorful box. If you prefer to order by telephone or by fax, click here for more information. Product Number USOPT55