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Cover picture: Stimuli used to evaluate color constancy performance in patients with unilateral brain lesions. The colors of the small squares were determined by illuminating objects with known reflectance functions (Munsell chips) with lights of different spectral content. The background squares show Munsell chips under a neutral illuminant (CIE illuminant C), whereas the framed insets illustrate the color changes when the illumination is changed to a yellowish (top left), bluish (top right), greenish (bottom left), or reddish (bottom right) light. Humans are able to maintain constancy of the color appearance of an object, despite these large variations in the light incident on the retina arising from changes in the spectral content of the illuminating light. The results show that some patients with circumscribed lesions of visual cortex lack this ability. For details, see the article by Rüttiger et al., in this issue (pages 3094-3106). Design and layout by Dr. Karl Gegenfurtner.