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If a man have a tent made in linen of which the apertures have all been stopped up, and it be twelve braccia across and twelve in depth, he will be able to throw himself down from any great height without sustaining injury.

人若用细麻布作帐棚，其上的窟窿都塞住了，就是横着十二肘，纵深十二肘，从高处坠落，也没有受伤。

— Leonardo di ser Piero da Vinci 达芬奇爵士