Nothing says you are clueless about what to buy someone like a gift voucher. Normally I would consider them a last resort, yet last Christmas, I received a rather more imaginative token.  I was presented with a card with an image which looked alarmingly like a dead body. Thankfully, the voucher was not for my own funeral, but entitled me to an hour’s float in a sensory deprivation tank. You could be forgiven for thinking of sensory deprivation as the latest hipster fad to come out of the wellness industry. While I had some reservations, I wanted to experience it…