While unimaginability may fit the original conception of a black swan, Taleb's book is "The Black Swan: The Impact of the Highly Improbable" (not unimaginable o

While unimaginability may fit the original conception of a black swan, Taleb's book is "The Black Swan: The Impact of the Highly Improbable" (not unimaginable or inconceivable) and defines a black swan as "an outlier, as it lies outside the realm of regular expectations, because nothing in the past can convincingly point to its possibility." http://www.nytimes.com/2007/04/22/books/chapters/0422-1st-tale.html http://www.nytimes.com/2007/04/22/books/chapters/0422-1st-ta...