the.com/vestibular
The inner-ear gyroscope that knows which way is up so you don't.
means Relating to the inner-ear system that senses balance, motion, and head position to keep you upright and oriented.
from From Latin vestibulum, an entrance hall or porch — the anatomical antechamber leading into the deeper labyrinth of the inner ear.
Fluid physicsSpinning fools the fluid, which is why you stumble.
Eye linkIt steadies your gaze as your head moves.
Astronaut foeZero gravity confuses it into space sickness.