Here is an interesting tool for those curious about meditation, and in particular ‘tuning in to what is inside the head’.
A ‘floatation’ or ‘sensory deprivation’ tank is a tub where one floats in skin temperature water, in the dark, and no sound. With no external reference points and no sense of body it is quite a unique experience, particularly interesting if you’re into any form of mind training or suffer from insomnia.
You may have seen them popping up in wellness centres and gyms already. I expect they will become mainstream in 5 years.
Here’s a link to one in London.