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activity adaptation after-image angle animals anomaloscope appear arrow illusion autokinetic effect babies blind brightness camera cells colour vision compound eye cones constancy scaling convergence cornea corner cube curves dark depth perception described developed direction distance distant objects distorted effect ellipse Emmert's Law evidence experience experimental eye and brain eye movements eye/head fact fibres flash function give given green hallucinations Helmholtz illusion figures image/retina system important intensity inverted J. J. Gibson kind learning lens lenses lines look moon movement signals muscles Necker cube nerve neural normal observer ommatidium optic optic nerve patterns perceptual system perspective phi phenomenon photographic photographic flash picture position possible prisms problem produce Psychol Psychology R. L. Gregory receptors region represent retina retinal image reversed rotating seems seen sensitive sensory shadows shape shows simple space stereo stimulation suggests surface theory tion touch velocity visual system visual world wavelength yellow