the ganzfeld effect (from german for “complete field”) is a phenomenon of visual perception caused by staring at an undifferentiated and uniform field of color. the effect is described as the loss of vision as the brain cuts off the unchanging signal from the eyes. the result is “seeing black” – apparent blindness.
arctic blizzard white-out
at sea on a new moon
going to the bathroom in the middle of the night
spending eight hours in the local anechoic chamber
…rarely does one experience the ganzfeld in nature