Frank Lloyd Wright's famous Saguaro Forms and Cactus Flowers design lends itself beautifully to a puzzle and a greeting card, so why not both…all at once? Here's how a Greeting Card Puzzle works: The 60-piece, 5½"x7½" puzzle arrives to you assembled. Flip it over, write your personal message on the back, then break the pieces apart and tuck them into the included envelope. Finally, pop it in the mail to someone you know who will be delighted to "solve" the puzzle of your ingenious greeting! Extra postage required.