Black swan emblems and popular culture cluster in Australia: Upper Swan, Middle Swan, Swan Valley, Swan View, West Swan, Swan Estuary, Swan District, and the City (formerly Shire) of Swan. The Swan Land District is the major cadastral unit of the state, underlying much of the name cluster. There are at least twenty "Swan" street names in the Perth metropolitan area. There are no "White Swan" toponyms in the state, and the toponymist Reed lists only the Swan River as a "Swan" toponym in the state. The rarer form of "Cygnet" ("young swan") only occurs in three places, all along the Kimberley coast, where they commemorate
Black swan theory black swan event depends on the observer. For example, what may be a black swan surprise for a turkey is not a black swan surprise to its butcher; hence the objective should be to "avoid being the turkey" by identifying areas of vulnerability in order to "turn the Black Swans white". Taleb's black swan is different from the earlier philosophical versions of the problem, specifically in epistemology, as it concerns a phenomenon with specific empirical and statistical properties which he calls, "the fourth quadrant". Taleb's problem is about epistemic limitations in some parts of the areas covered in decision making.