U2 tower is an office building that was supposed to constructed in dublin harbour, with a recording studio of this amazing group on the top floor. We associated Ireland with a country where even the stones are filled with music. An idea came up that the building, oriented east-west, reffered to the rugged Irish rocks. It was nicked with vertical slits, that revealed the crystals hidden inside. One of them was supposed to be the U2 recording studio. Every day, at sunrise and sunset, the sunbeams cut the building bringing out the luminous music contained in the crystals.