Hopping into a soundproof, light-proof box filled with saltwater may be a popular relaxation therapy today, but those just discovering it are likely asking themselves: “who came up with this strange device, and when were float tanks developed?” In order to answer those questions, we first have to ask “why did they want to make them in the first place?” In the early 1950s, neuroscience was a relatively new field of study, and how the brain worked was much less understood than