"Halcyon Floats, South Kensington by Melissa McFeeters. Periods of calm during the winter are called Halcyon Days. Ninety minutes of calm in complete darkness, floating weightlessly while your anxiety drifts away—that’s Halcyon Floats. Each tank holds 850 pounds of Epsom salts dissolved in just 10 inches of water, which creates the buoyancy needed for you to float perfectly on the surface. They say the total darkness can cause hallucinations, but I’d shell out just for the peace and quiet."