Temporality
Although motion is not the only means by which depth is interpreted, it distinguishes itself from all other depth cues by virtue of its temporality. Depth variations revealed by motion are determined across time. The mind determines the shape of an object, or an empty space, based on how its appearance changes over time. However, the changes in appearance only make sense to the extent that they are relative to the observer's perspective. So, the observer's perspective is effectively harnessed by the process of determining depth through motion. It becomes a "tool" for determining depth and, as a result, our sense of immediacy is dulled.
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