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the quality of remaining stable or unaltered.
form constancy the ability to recognize forms and objects as the same in spite of variation in environment, position, and size.
object constancy the capacity to understand that an absent person or object exists and will return.
1. the tendency for objects to be perceived as unchanging despite variations in the positions in and conditions under which the objects are observed; for example, a book's shape is always perceived as a rectangle regardless of the visual angle from which it is viewed.
2. in psychoanalysis, the relatively enduring emotional investment in another person.
the ability to perceive an object as unchanging even under different conditions of observation. See also object permanence.