It was a busy day today -- yet in between I experimented briefly with a Peltier device (pictured). These convert power to heat and cold. And the purpose? I was designing a conjuring trick, and was thinking on how objects hidden in a sealed box could be revealed to the conjurer. I had already tried neural signals, successfully. These are relatively data-intensive (in transferring data from inside a box to a conjurer), but a little complex to implement. A Peltier device offered far less data-transfer -- but great simplicity -- and, like neural signals, complete inscrutability. The device communicates of course through tactile sense.
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