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It's a child's problem: we see objects as oriented correctly, both up-down and left -right, despite the fact that our retinal images of them are inverted in both respects; how can this be? The reason it is a child's problem is that the explanation is so easy: there is no reason to think that the properties of our retinal images should correspond to the content of the visual experiences they cause. Our retinal images are tiny; we see things as much larger. Our retinal images are uniformly the color of the retina; we see things as possessing a diversity of colors. None of these discrepancies, including the discrepancy in orientation, are unexpected, and so none genuinely problematic.
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