There are a number of reasons why I might consider one of works to be singular. It may be an exceptionally rare species in captivity, an unusual color mutation or a superlative specimen. As I rarely duplicate the shape of my serpents, most will be considered Single Editions.
However, it is in my Definitive Works where the most traditional Single Editions are to be found. These are unprecedented pieces that I feel either could not or should not ever be repeated.