Why do bars 6 and 7 stay in place and don't slide down?
Leonardo da Vinci invented the self-supporting bridge between 1485 and 1487.
This is how it works:
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https://blossom.primal.net/a3220a6287441335556ca18432877caf0d101d0a26b3f99f0e3f17c83e561377.mp4
Why do bars 6 and 7 stay in place and don't slide down?
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