The Clock of Eras is a material that helps students visualize the length of the different periods of the Earth. Part of its impressionistic appeal is to see that humans have not been around for a long time. Even ancient animals like dinosaurs have only existed for a relatively small chunk Earth’s existence. By playing the Clock of Eras game, the kids will actually play games representing these time periods in intervals that are proportional to the time on the clock. Instead of just seeing the clock as a fractional piece, they will experience the switching of time, as well as feeling how relatively short or long a period is compared to another one. This game will help them appreciate how short some of their favorite time periods actually are.