Planephones, or planofoni, represent an innovative sound art creation.They are vibrating systems based on wood panels (or other materials) and different forms. Planephones diffuse the sound according to specifications which depend on the structure of the material, on the geometry of the design, on the orientation and curvature of the surfaces, and on the plastic volumes occupied. Planephones were conceived by composer Michelangelo Lupone, as art installations (1997), and are the result of studies on the vibrational qualities of materials with the collaboration of CRM-Centro Ricerche Musicali.