A term coined by psychologist Carl Jung to describe what he called "meaningful coincidences," synchronicity is the experience of two or more causally(因果関係に)unrelated events that are conceptually similar and have very little chance of occurring together randomly - such as the discovery of the same idea by two different people at approximately the same time. Jung felt the principle was conclusive evidence for his concept of the "collective unconscious(普遍的無意識)."