Wood Trick makes a really cool build-it-yourself Mayan style perpetual wall calendar that can actually track dates using the modern Gregorian calendar. The model comes flat-packed and features 73 pieces that, according to the product page, are easy to assemble for both kids and adults.

The Mayan Calendar needs no introduction. Wood Trick has developed its own version of this famous calendar. Be calm, our calendar will not predict the end of the world and other apocalyptic phenomenons:) It will be an excellent addition to the interior of your home, as well as help you always be aware of day, week, month and year!

–Build-it-Yourself Mechanical Mayan Style Wall Calendar – $35.95 $17.97 (Clip Coupon at the Link!)

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