Here's the finished calendar. It uses heads or tails to spell out a binary number for the day of week, month, and date (the binary system is used internally by all modern computers). In this configuration, Wednesday, December 31, 2008, is represented. If this explanation is gibberish to you, pop over to evil mad scientist laboratories for a breakdown and some tutorials on binary numbers.
Images via evil mad scientist laboratories.
Laure is a Los Angeles–based photographer and design enthusiast. When not contributing to Dwell and Apartment Therapy, she's opening too many tabs in Firefox, baking, gardening and exploring the great outdoors.