There are little canals in your ears with hair and fluid. When you move the fluid moves, the hair recognizes that movement and sends the signal to the brain. It detects both angular and linear movements, and therefore the ears can literally detect in which position your head is.
But in the end it’s your brain that analyzes all the data it receives. If the data between eyes and ears mismatch, you start feeling sick, or even start having trouble keeping balance.
It’s a complex mechanism that even allows us to move on two legs.
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