ABSTRACT
All perception takes place as an encounter between the perceiver and his environment in a life situation in which the perceiver relates to the environment at a particular moment, now, in a particular situational configuration of which he and the environment are constitutive. Neither perception nor any other act of a living organism takes place in a vacuum, or in a neutral field, or ever in the same field for two different perceivers or for one perceiver at different times. This holds true also for artificially controlled and standardized conditions of the experimental laboratory. That this has often been overlooked has led to many errors and faulty theories based on the evaluation of data obtained in such experiments. 1
