Thought always comes from somewhere. Awareness is always identified with a perspective, with the premises of some system, beginning with the body, and focussed on some object. Such thought cannot contain opposites, cannot encompass both the object and its shadow in the same breath. It cannot illuminate areas hiding in shade. Even so, there are no intrinsically dark regions.
Darkness is always relative to the source of light, to the mind's assumptions.
Shift the light and the shadow moves accordingly. There is an intimate relation between negation, or logical contradiction, and processes that oscillate in time. Once in motion, inertia carries a pendulum, for instance, past its natural resting place until its motion has been entirely converted to potential energy through the resistance of gravity. It then swings back the other way, gaining kinetic energy at the expense of its height, and so on. The logic of this behavior could be described as 'if yes, then no'.