Figure 2.

Control observations validating the techniques used here. (A) Same digital photograph as in Fig. 1 but tilted at a 45° angle. (B) Analysis showing that the magnitude of the orientation biases observed in Fig. 1D are similar but that their distribution is shifted by the expected amount. (C) Digital “scene” comprised of random noise. (D) Combined analysis of 10 such scenes. Note the absence of anisotropy in this control.