Optical delusion.
The way we see the world in our heads is actually artificial, as our brains are not able to reproduce the exact image as a camera video does. However, what our brain does is so much cooler than a camera. In fact, it creates its own model of the world using the information provided by modules that measure shade, light, curvature, edges, and so on.
This way, your brain is able to paint out the blind spot, an area of the retina in which the optic nerve joins. This area is known to have no sensors whatsoever, but it compensates for fast movements by creating a false picture of the steady vision.
However, the only downside of this incredible process is that it can make our eyes easy to fool, by misleading the brain about what the eye is seeing. Optical delusion is the answer for the moon looking much bigger than it is in reality.
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