The Plug V

"The plug V" (as in Vertical) has been designed to celebrate the Kossel printers and their derivatives (such as the Kossel Clear). The Plug is designed to serve as a lamp and mixes two mathematical parametric functions.
The first parametric surface gives the general shape of the lamp. It has been discovered by the French mathematician Jules Tannery (http://en.wikipedia.org/wiki/Jules_Tannery) and is known as Tannery's pear. If you are curious and read French, have a look to the correspondin