On the midsummer solstice this year, shining down through a window built into a Texas mountain, the sun woke up a clock in the process of being constructed to measure precisely 10,000 years to come. The rays passed through the window, made from sapphire, and on to a giant round quartz lens, warming air in a chamber beneath.
The temperature of the gases rose, causing their pressure to increase, which shifted a lever that released a catch. It moved by the exact amount required to synchronise the instrument, known as the Clock of the Long Now, with the heavenly body above.
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