If you're into body hacking, you may want to consider this procedure by Dann Berg, who had a small magnet implanted in his pinky. While the magnet is weak and really only allows him to lift a paperclip, the real delight comes in the "sixth sense" he's acquired, picking up on an invisible world of magnetic fields all around him.
I quickly learned that magnetic surfaces provided almost no sensation at all. Rather, it was movement that caused my finger to perk up. Things like power cord transformers, microwaves, and laptop fans became interactive in a whole new way. Each object has its own unique field, with different strength and texture. I started holding my finger over almost everything that I could, getting a feeling for each objects invisible reach.
[...] The best part of having the magnet implant was discovering invisible magnetic fields when I wasnt actually looking. The first experience I had with this was walking through the intersection of Broadway and Bleecker in Manhattan. I passed through this intersection a few times before realizing that my finger would tingle at a certain spot. After paying a bit more attention, I realized that I was feeling something underground. At first, I assumed it was a subway car, but later came to the conclusion that it was most likely the subway power generator, or the giant fan that was cooling these generators. After noticing these underground waves at Broadway and Bleecker, I began feeling them all over Manhattan.
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