An evening pause: Humans can make anything out of anything. From the youtube website:
The model is completely made of paper and cardboard….Strings are made of paper strips, tension mechanism is like one in guitar, using worm-gear (worm is made of paper, gears – from cardboard). Soundboard is combined with stiffness frame and made of 2.5mm cardboard enforced with stiffening ribs. Hammers – from paper and cardboard, dampers – from rolled up paper napkin, keys – from paper. Body is made of cardboard and painted.
Hat tip Martin Kaselis.