rooms to carry books through

The setup I use consists of two parts an electronic instrument and ten speakers. The speakers are switchable they are used to distribute the sounds in the room. The instrument is a combination of piezoelectric contact microphones and piezoelectric speakers placed inside a book. The book is a resonator and a filter. The instrument is based on the feedback between piezo microphones and speakers. In order to play the instrument I press my hands on top of the book, thereby the conditions for the feedback change.