Mosaics are pictures or decorations made of small pieces of materials like stone, glass, or ceramic. The art of mosaics dates back to ancient times and was widely used by the Romans to depict gods, daily life, and geometric patterns. Ravenna, Italy is particularly renowned for its well-preserved Byzantine mosaics from the 5th-6th centuries depicting emperors and religious scenes. Mosaics continue to be an artistic medium today through works by modern artists like Niki de Saint Phalle and references to past designs.