Academy 18150 Da Vinci Clock

Leonardo Da Vinci developed a number of designs that were well before their time. His vision of vertical flight with his spiral helicopter, paddle wheel-powered vessels, and the early armored car may have been laughable in his day, but were the stepping stones for today's MV-22 Osprey, turbine-powered Ticonderoga-class cruisers, and M1 Abrams tank (and their analogs from other nations of course).
Here is a representation of da Vinci's clock which uses a horizontal pendulum and weights for power. This kit is completely snap-together - no glue, paint, or batteries required. This project literally took a few minutes though a careful eye to the instructions is required to ensure that the various parts are properly oriented. The engineering of this kit is well done though and you can see the results below. I really do enjoy assembling and tinkering with Academy's Da Vinci kits!