"The old senate house was a cool, gloomy, cavernous temple of government, split by a wide central aisle of black and white tile."
The Curia Iulia (later senate house)
GNU Free Documentation LicenseThe Curia Iulia (later senate house) - Credit: Longbow4u/Wikimedia Commons

Unfortunately the old senate house no longer exists, but the new senate house (curia) still stands in the ruins of the Roman Forum today. Black and white mosaic designs, like the one described here decorating the senate house floor, were popular in Italy at this time.

                       

Black and White Mosaics from Hadrian's Villa at Tivoli
Public DomainBlack and White Mosaics from Hadrian's Villa at Tivoli - Credit: Marie-Lan Nguyen/Wikimedia Commons