Figure 32 (Relative size) illustrates the criterion of relative size. Although the graph is two-dimensional, the difference in size of the two circles leads us to assume that the small object is farther away than the large one. Thus, assuming that things are the same size, a smaller object appears to us to be farther away than a larger one, and from this the visual system derives the impression of spatial depth.
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Main Image creation, Depth and Size
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