Combining three musical instruments in one instrument

http://www.Shahab-Tolouie.com/fusetar
FuseTar " Lucifer", is a triple neck (guitar & setar), 16-stringed, new hand-made music instrument, created by Iranian multi-instrumentalist and composer Shahab Tolouie. It took a year and half for two luthiers Mehr & Owrang to build the FuseTar.
The name is derived from "fuse" -- English for "fusion" and "tar" -- Farsi for "strings"; hence 'fusion of strings'. The nickname Lucifer is that of the mythological morning star, the bearer of light.

The uppermost is a fretless neck, which makes possible to play the quarter-tones peculiar to eastern music. The middle neck is the 'guitar neck', a combination flamenco/jazz guitar configured with the True Temperament fretting technology, which produces more accurate intonations and longer sustain than a normal guitar and is used, for example, by John McLaughlin and Steve Vai. The third neck is a Persian 'setar neck' with four strings fretted for quartertones, a traditional instrument whose roots stretch back 2,000 years. This is the first time a traditional Persian instrument has been modernized with the fixed, True Temperament fretting system.
The control knob plate is decorated by the words of the Cyrus Cylinder - 539 BC which is been claimed to be an early "human rights charter".