He promised not to use magnets.
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The young artist Sven Saksalberg threw an ordinary needle into a haystack as an art installation. He bet that he would find the hand again and made a video in which he explained his technique.
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The haystack was deliberately chosen significantly – 3 m high and about the same diameter. The mathematical probability of finding a needle here is extremely low; without a magnet, such a search would take about 30 years.
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But Sven bet he could do it in just two days. The performance was moved to the museum building, and the guards watched – the man promised not to use magnets or other tricks. His technique was simple: Saxalberg took a handful of hay and pressed it into the palm of his hand.
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After 29 hours, the needle was finally found. Sven was lucky. The hand got stuck in the bundle and was easier to find.