This classy bookcase fits neatly into the corner, don't you think? Entero, a custom furniture company in Estonia, made it from a ruined antique piano:
As work progresses, the strings and hammers where removed from the body. The body was made deeper that we could build there bookshelf. The keypad was restored. Piano lacquer casing was removed, damaged veneer patterns where repaired and to the edges we made new moldings from mahogany and we lacquered it with glossy varnish. The bookshelf was made from mahogany veneer, and the contents were prepared with matt lacquer.
You can view more pictures at the link.