"Vection" Illusion (The Psychological Pull)
( I'd love to write what I often experience when traveling and sailing, although the transit I was onboard was temporally stationary.) The brain determines motion by comparing your body to your surroundings.When water moves rapidly in one direction, your eyes register the motion. As the sky and horizon feel fixed, your brain misinterprets the rushing water as your own body moving in the opposite direction. This visual illusion is called vection, and it intensifies the physical feeling of being pulled or pushed by the tide. That physical sensation is caused by a combination of fluid dynamics, soil mechanics, and a sensory illusion. When a wave recedes, water flows rapidly backward toward the ocean, pulling loose sand grains from around your feet and eroding the support beneath you. At the same time, your body weight presses down on the water-saturated sand, forcing the water out and causing the sand to behave like a dense liquid through localized liquefaction, which makes you sink...