Black swans were thought not to exist -- until they were discovered in Australia, in 1697. A black swan has thus become a metaphor for what is considered impossible until it is proved true. The event is then rationalized by hindsight.
BKS6892 Finish: Solid brass, electro-plated with hematite finish, giclee print Dimensions: Approx. 1.25" W x 3.75" L (Packaged in Recycled PET Plastic Sleeve with Provenance Card)