Leading experimentation to understand sensation as well as perception.
Plug three medium-sized bowls with
(a) Very hot (however not painfully so) tap water,
(b) Very cold tap water and
(c) A mixture of the very hot as well as very cold water. Arrange them, therefore your right hand is in front of the cold water, your left hand is in front of the hot water, and the lukewarm water is in the middle. Submerse your hands into the water (right into cold, left into hot) for about three minutes. After three minutes quickly transfer both hands to the lukewarm (middle) bowl. Explain what did you sense?