Your eyes actually see the world upside down, but your brain flips the image for you.

The human eye functions much like a camera lens. When light enters the eye, it passes through the cornea and the crystalline lens, which refract or bend the light rays. Because the lens is convex, these rays cross paths as they travel toward the back of the eye, resulting in an inverted image being projected onto the retina.The retina contains millions of photoreceptor cells known as rods and cones. These cells convert the light patterns into electrical impulses that travel through the optic nerve to the primary visual cortex at the back of the brain. It is here that the brain performs the complex task of reinterpreting the data and flipping the image right-side up.A famous experiment conducted in the 1890s by psychologist George Stratton at the University of California, Berkeley, proved the brain's incredible adaptability. Stratton wore special reversing glasses for eight days that made the world appear upside down. By the end of the week, his brain had adjusted to the point where he could navigate his environment normally.This neurological flexibility is known as perceptual adaptation. It demonstrates that our visual experience is not a direct reflection of physical reality but a sophisticated reconstruction created by the brain. Without this constant processing, our spatial orientation and coordination would be impossible.