@serious_brofun on Instagram: "What looks like a simple marble toy is actually a 700-year-old mathematical idea in motion. This device demonstrates the Tusi Couple, where two perfectly synchronized circular motions combine to create a straight-line path. Invented by 13th-century Persian scholar Nasir al-Din al-Tusi, this principle was once used to explain planetary motion in astronomy. The steel balls only appear to move straight, but their path is the result of pure geometry cancelling curves i
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@serious_brofun on Instagram: "What looks like a simple marble toy is actually a 700-year-old mathematical idea in motion. This device demonstrates the Tusi Couple, where two perfectly synchronized circular motions combine to create a straight-line path. Invented by 13th-century Persian scholar Nasir al-Din al-Tusi, this principle was once used to explain planetary motion in astronomy. The steel balls only appear to move straight, but their path is the result of pure geometry cancelling curves i
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