
You’re one year older and you wake up to a big surprise– your friends are blindfolding you and taking you out to a birthday treat! You drive for a while, walk a couple of blocks, take off your blindfold and find yourself in a grassy park with a cake in front of you. Lucky you! However, you’ve never been here before, so how do you know if you’re actually at a new place or just in front of a huge, detailed picture?
Well, it’s not that likely that you’d be brought to a place where there is such a large image, but being able to tell the difference between a complicated 2-dimensional picture and a 3-dimensional place with objects is something we often take for granted. Thanks to what are called depth cues, we can use these hints to tell that a tree is farther back behind another tree, and not equally far from you as they would be in a flat photograph.
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