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adaptation African ambiguous angles animals aposematic appear artist assumptions beetles behaviour birds bright butterflies caterpillars changes Colin Blakemore confounded eye cubist cues Deregowski diffraction gratings distance distortions drawings E.H. Gombrich effect errors evoking example experience fact false female figure flowers ganglion cells Gestalt H.E. Hinton Illusion and art Illusion and culture illusory inappropriate insects interpretation kinds lateral geniculate nucleus lateral inhibition light lines look Me'en mechanism mimic mimicry movement Natural deception nerve neurons normal objects observer optical orientation painting paradoxical pattern perception perceptual hypotheses perspective photographs photophores physiological Picasso pictorial depth picture pigment plants poisonous pollinated praise of illusion predators produce Psychol pupa R.L. Gregory reaction reality receptive field representation resemblance response retina retinal image Roland Penrose scaling seems selective sense sensitive sensory shape signals space SPADEM species spider stimulation strategies suggest surface theory three-dimensional ultraviolet vertebrates visual cortex warning colours