  That which is constant receives less attention, that which varies must be brought into equilibrium. It is this process of bringing contrasts into equilibrium which is at the basis of all organic processes, evolutionary, developmental, and perceptual. The organism is a dynamic system that has innate tendencies to self-regulation and equilibrium. When equilibrium is disturbed, which can happen on a variety of levels, the organism works to form a new equilibrium. The senses are not things that got passively written on, but rather things that interact with environments. Life is not mechanistic but teleological.