The black swan event is a metaphor for a highly unlikely event with far-reaching implications for society. The author of the black swan theory is professor, philosopher and analyst Nassim Nicholas Taleb. He was inspired by an event from the 17th century, when the first mapping of the Australian continent took place. At that time, the Dutch expedition observed black swans for the first time in history. This refuted the hitherto unquestionable claim that swans are only white.