Synchronity – What exactly is it?

Synchronity is the experience of two or more events that occur in a meaningful way, but which are not causally related. In order to be synchronous, the events have to be conceptually related to each other and the chances of them coming together at random chance are very low.
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(From Wikipedia)

The term synchronicity was first coined by the Swiss psychologist Carl Gustav Jung. He studied for many years under Sigmund Freud, the great pioneer of psychoanalysis, until he severed ties with him on the fundamental question of Freud’s sexual theory. Freud believed that every desire or inspiration or ambition was rooted in sexual desire, and his theories became fashionable around the world, especially in the United States, in the middle of the twentieth century.
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Jung believed that human inspiration was not exclusively based on sex, and he went on to formulate his archeological theories to explain behavior, among other things. His work was based on Freud who did extensive research on the meaning of dreams. Freud’s book, Dream Interpretation, has become one of the best-selling psychology books of all time. Jung’s investigation of human dreams leads to the notion that dreams have certain types and characters, and that these characters are common to all people and cultures. He calls them archetypes.
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The discovery of his archetypes led him to explore different cultures, including the ancient world. While studying culture in ancient China, he came across a book we know as I Ching. It is a book of prophecy or fortune-telling, if you will, where the reader thinks of a question he wants to answer, while performing a seemingly random process with stalks made of yarrow, which leads to a specific page of the book. This page then provides the answer to the question.
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Jung saw that the book contained an astonishing number of letters and correct answers. In other words, it worked. It was this phenomenon that led Junk to the notion of synchrony to explain the correlation between random page selection and real-world events.