Abstract
An illusion in depth was produced by using a series of similar objects of different sizes. It was found that the adjustment of a binocular disc to apparent distance equality with a part of the binocular illusion was influenced by the line-of-sight position of the disc with respect to the illusion. It is hypothesized that a binocular depth illusion will least disturb the apparent relative distance of the disc from S with respect to the part of the illusion which is most nearly in line-of-sight with the disc. It is suggested that the binocular disparity between the disc and a frontally adjacent (line-of-sight) object is functionally more important than that between the disc and a frontally displaced object, regardless of which of these binocular disparity relations S attempts to use.

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