Monocular Cue: Relative Size

A monocular cue is a depth cue that is available to either eye alone. One type of monocular cue is relative size, which is the size of an object that our eyes perceive based on the distance away from us. If two objects are similar in size, we assume that the one that is closest to our view is actually the bigger object than the other.
In the picture below, both the man and the Eiffel Tower are pretty similar in size. We already know from past experience and knowledge that the Eiffel Tower is much taller than the man in reality. Because the man is so far away from the tower, it makes it seem as if he is actually a bit taller than the tower. Because of his darker color compared to the tower, and the lines made by the bushes around him, we can assume that he is actually closer to us, but not as tall as the tower. It is only an illusion to make it seem as if he is as tall as the Eiffel Tower. So yes, he is bigger than the tower in this picture because he is closer to us, but in reality, the tower is much taller than him.



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