Cover legend: Brain-shaped version of Akiyoshi Kitaoka's “Rotating Snakes” illusion. In its usual presentation, the image consists of concentric circles of stepwise luminance gradients with curved edges, which produces a strong illusion of rotation in most observers. New evidence suggests this illusion is produced by transient oculomotor events such as microsaccades, saccades, and blinks, rather than continuous drift. For more information, see the article by Otero-Millan et al. (pages 6043–6051).