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A three-dimensional head model was stretched along the axis perpendicular to the symmetry plane by a factor of cos(25)/cos(35) and was compressed along the horizontal axis in the symmetry plane by a factor of sin(25)/sin(35). If this head is rendered in orthographic projection with an orientation of 35 deg (with respect to the frontal view) using only ambient light, it results in exactly the same image as the projection of the undistorted head projected with 25 deg orientation. Instead of ambient light we use directional light. Surprisingly, rather than revealing the distortion in depth, directional illumination causes the projected image of the distorted head to appear considerably wider. We quantitatively measured this illusion by determining the point of subjective equivalence (PSE) using a fixed-interval nulling paradigm.

An illumination induced visual illusion that affects the perceived width of a human head