Psychologist Carl Jung brought the word “synchronicity” into popular usage in the 1950s through his writings on coincidence and human nature. In his book “Synchronicity: An Acausal Connecting Principle,” he wrote, “What I found were ‘coincidences’ which were connected so meaningfully that their ‘chance’ concurrence would represent a degree of improbability that would have to be expressed by an astronomical figure.” He suggested viewing synchronicities as opportunities for greater understanding and internal reflection, and not just mere chance.