In Gestalt theory we also consider the individual and the environment as a unified field or system, in which
all parts are interdependent, so as a unified field or system, in which all parts are interdependent, so that a
change in one part of the total affects all other parts, This relation between the individual and the
environment is succinctly stated by 'Fritz Perls (1973, p. 16) when he speaks of the contact boundary: