Six surface textures possessed differing degrees of irregularity as measured by the standard deviation describing the irregularity, and numbers of redundancies. Each surface was presented at 9 different slants to a different group of 12 Ss who monocularly viewed the stationary surface through a 38° aperture. Regression coefficients measured effects of texture on slant judgments. A replication with 6 Ss to a group and different Es was performed 4 mo. later. Judgmental errors varied with the magnitude of an irregularity, redundancies having lesser effects. Individual data and effects of a blank surface are also evaluated.
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