laser
https://www.laseros.com/laser/cube/ 210 weeks, 5 days and 2 hours ago

laser, moon, projection
http://what-if.xkcd.com/13/ 633 weeks, 6 days and 22 hours ago

laser, moon
http://what-if.xkcd.com/ 633 weeks, 6 days and 22 hours ago

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