For example take a tree. How can our brains tell that it is a big tree far away instead of a smaller tree which is just closer to us?
In: Biology
Up close, your brain uses trigonometry – it uses the difference between the images coming into each eye to calculate distance.
At greater distances, where the angle is too small, it uses your knowledge of how big things should be. (Which is why it is very hard to estimate distance if there are no familiar objects in sight – a car, building, tree, person, etc).
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