An explanation was sought for overestimation of acute angles, especially when those angles are presented in a horizontal orientation. 22 Ss ordinally ranked 8 45° angles oriented horizontally and vertically in either a position which would be bisected by the Cartesian axes or in which one arm would be on the axis with respect to how likely it was to suggest a right angle seen tilted in depth. Horizontally oriented angles were ranked most likely to produce the effect (Wilcoxon test, t (18) = 0, p < .01). The explanation was applied to studies which show overestimates of acute angles.
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