For centuries, painters painted scenes with parallel verticals, and no one affirmed it unnatural. Should we totally correct the perspective? Logically yes, because that is how the human brain sees it. On the other hand, the cinematographic and advertising iconography has used and abused downward / upward shots so it may seem natural … but it is not at all! Before the appearance of correction software and in the absence of a shift lens, the effect was inevitable. Although the first photographers took great care to avoid it by using tilted view cameras. Accepting a downward or low angle vision with vanishing verticals is a recent issue which appeared with the invention of photography. The verticals are always represented as genuinely vertical (parallel) and the horizontals as vanishing (non-parallel). The rules of perspective are known since the Renaissance and painters apply them ever since. We can add that man has a particularly powerful image processor: the brain. While human vision is binocular, a camera is monocular.
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