The importance of the finger-nail in classical guitar performance cannot be under-estimated. A guitarist must take great care to shape the nail appropriately, the resulting interaction with the string being the main determinant of articulation and tone. When I was young I discovered that numerous coats of a nylon-fortified nail-polish did great things for my tone. Often guitarists will go to elaborate measures to repair their nails if damaged before a gig, occasionally resulting in grotesque hybrids of nail and acrylic bonded with cyanoacrylate. I imagine this interaction of the synthetic with the organic as parallel to the interaction of creative-intent with six strings, four fingers, and four finger-nails.
Christopher Ariza performing live electronics with KIOKU. More information.