Can Virtual Meditation Help You Hack Your Consciousness?

The flotation pod is smaller than I'd expected. It's white and round like an egg and, at first glance, seems like it couldn't be any longer than I am tall. Sitting in a tiled treatment room at a day spa in Carroll Gardens, the pod looks incongruous, like someone left an oversize computer mouse in a bathroom. I'm here, at a place called Lift Floats, to try sensory-deprivation flotation -- a Sixties throwback technology, invented by the neuroscientist John C. Lilly (best remembered today as the guy who came up with oddball experiments to study human-dolphin communication), that has lately regained popularity, particularly among athletes and Silicon Valley types. After being shown to the room, I shower, enter the pod naked, and close the lid. I lie back as the pod starts to play gentle music and the faint LED lights bathe the water in colors.