The mind is amazing

It's crazy how something so small can be so strong:

'A dose of LSD, or lysergic acid diethylamide, targets a specific serotonin receptor called 5-HT2A, and in doing so appears to throw our senses into a jumble. As a result, images we would never normally perceive become vivid and fool our brains into thinking they are real.

"The drug can also cause synaesthesia, a condition which happens naturally in a small percentage of the population, where your senses get mixed up and you start smelling colours and tasting sounds," says Dr Stanford.'

Guardian UK