Made of stone and steel

Time Machine


Will a clock that works flawlessly for 10,000 years become the greatest wonder of the world?
Prototype number two of the Clock of the Long Now is, at nine feet tall, a diminutive model of the final version, which is expected to be at least 60 feet tall and will have multiple displays. This prototype records the changes in the relative positions of Earth and the five other planets that humans can eyeball without a telescope. "If you came up to the clock thousands of years from now, you could still read the time, even if you did not have the same time system we use now," says designer Danny Hillis.
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