Designed by Bruno Rainaldi for Opinion Ciatti, Ptolomeo X4 is a vertical self-standing 360* revolving bookcase. Its structure and shelves are in black or white lacquered metal, the base is in polished stainless steel for the black version or white lacquered for the white version. Available in three different compositions: Kit A - Made up of 8 shelves 13 cm apart, can hold 240 volumes or 680 CDs. Kit B - Made up of 4 shelves 26 cm apart, can hold 140 volumes. Kit C - Made up of 3 shelves 26 cm apart, can hold 165 volumes or 105 volumes and 170 CD.