“Software never appears without its interface. The human-computer interface is, first of all, the face of its software. In fact, the semiotic analysis emphasizes the tendency of the interface, considered as something between two systems, to disappear. If we assume the interface is an important, but in some way separate component of computing potencials, we render software faceless. But software cannot exist wihtout face. The face of software is its appearance at the periphery of the computer; without its face, it does not exist at all. (…) Recognizing that software always possesses a face provides a fruitful approach to software design. Design of software artifacts, then, includes design of its face. The interface between human beings and software artifacts disappears as a separate, material things and reappears as a semiotic process that is deeply entangled in aesthetics.”
NAKE, Frieder. GRABOWSKI, Susanne. The interface as sign and as aesthetic event. In FISHWICK, Paul. (org.) Aesthetic Computing. Cambridge, Mass.: MIT Press, 2006. P.67