In this context, something fascinating is https://en.wikipedia.org/wiki/Thermal_grill_illusion https://en.wikipedia.org/wiki/Thermal_grill_illusion You can art

In this context, something fascinating is https://en.wikipedia.org/wiki/Thermal_grill_illusion https://en.wikipedia.org/wiki/Thermal_grill_illusion You can artificially induce a burning pain sensation using alternating strips of mildly warm and mildly cold. Here William Osman of all people builds one of these and uses it on his friends https://www.youtube.com/watch?v=yw67_k6oDQY https://www.youtube.com/watch?v=yw67_k6oDQY