Perception of interdependent opposites
Perception of interdependent opposites can be described as the experience of a powerful subjective feeling that reality is based upon a binary system in which the existence of fundamentally important concepts or situations logically arise from and depend upon the co-existence of their opposite. This perception is not just understood at a cognitive level but manifests as intuitive sensations which are felt rather than thought by the person.
This experience is usually interpreted as providing a deep insight into the fundamental nature of reality. For example, concepts such as existence and non-existence, life and death, up and down, self and other, light and dark, good and bad, big and small, pleasure and suffering, yes and no, internal and external, hot and cold, young and old, etc are felt to exist as harmonious forces which necessarily contrast their opposite force in a state of equilibrium.
Perception of interdependent opposites is often accompanied by other coinciding transpersonal effects such as ego death, unity and interconnectedness, and perception of eternalism. It is most commonly induced under the influence of heavy dosages of psychedelic compounds, such as LSD, psilocybin, and mescaline.