: While a patient was describing a dream about being given a golden scarab, Jung heard a tapping at his window. He opened it to find a scarabaeid beetle (a rose-chafer) of a similar golden-green colour, which he then presented to the patient. This event famously helped break the patient's rigid rationalism and advanced her therapy.

The term was coined in the 1920s by Swiss psychiatrist , who defined it as an acausal connecting principle .

: In 1950, all 15 members of a church choir in Nebraska were separately delayed for various "random" reasons (a car not starting, a dress needing re-ironing). Their collective lateness meant no one was in the building at 7:30 p.m. when it was destroyed by a furnace explosion. Scientific & Philosophical Perspectives

: Unlike cause-and-effect relationships (e.g., flipping a switch to turn on a light), synchronistic events are not triggered by one another; they simply occur in a parallel, meaningful way. Famous Examples

Synchronicity is the phenomenon of —events that occur at the same time and appear deeply related despite having no logical or causal connection. The Core Concept

: A synchronicity typically involves a connection between a psychological state (like a dream, thought, or feeling) and an external event in the physical world.