Human sensing is very relative. Just two days ago I was in a museum about tricks of the senses [1]. At one station there were three sandpapers. One fine, one me

Human sensing is very relative. Just two days ago I was in a museum about tricks of the senses [1]. At one station there were three sandpapers. One fine, one medium and one coarse. You had to first rub your hands on the outer ones simultaneously and then both on the one in the middle (the medium one) at the same time. Although it was one uniform sandpaper it felt different depending on the hand. I think with taste and smell it's very similar that smaller differences only really matter in direct comparison. Even experts after training will have a hard time, there are some studies out there where sommeliers didn't notice they got white wine with red food colouring. [1]: http://turmdersinne.de/en/home http://turmdersinne.de/en/home