But this particular illusion has recently reinforced scientists’ understanding of deeper, almost philosophical truths about the nature of our consciousness. Like all misperceptions, it teaches us that our experience of reality is not perfect. That alternating black-white patch inside the object suggests diagonal motion and confuses our senses. It’s moving up and down in a straight, vertical line. It appears as though the object on the right is moving diagonally, up to the right and then back down to the left. As you gaze at the left dot, try to answer this question: In what direction is the object on the right moving? Is it drifting diagonally, or is it moving up and down? But wait! Finish reading this paragraph first. Fix your gaze on the black dot on the left side of this image.
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