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because the textures will get smaller from a distance.
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Now, logically, this could still be
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a single thing standing upright
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with just dots going up smaller.
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But the natural assumption is the reason
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why the dots recede in this regular fashion
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is because it's receding in depth.
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Classic illusion ,
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the Mueller-Lyer illusion.
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People will see this as longer than this.
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It's not. If you don't believe me,
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print it out and measure it.