#constancy  the tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation
  supertype:  #perception  the process of perceiving
  subtype:  #brightness_constancy  the tendency for a visual object to be perceived as having the same brightness under widely different conditions of illumination
  subtype:  #color_constancy__colour_constancy  the tendency for a color to look the same under widely different viewing conditions
  subtype:  #shape_constancy  the tendency to perceive the shape of a rigid object as constant despite differences in the viewing angle (and consequent differences in the shape of the pattern projected on the retina of the eye)
  subtype:  #size_constancy  the tendency to perceive the veridical size of a familiar object despite differences in their distance (and consequent differences in the size of the pattern projected on the retina of the eye)

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