Dolphin Mosaic The Dolphin Mosaic illustrates a dolphin with geometric forms on the border in black and white. This masterpiece is an entirely handmade mosaic reproduction created using the techniques of ancient romans called "Opus tessellatum", cubic stones tiles mosaic. During its manufacture 8 mm stone and natural marble tiles are used, all together being fixed on mortar with a metallic structure. Material: Marble Dimensions: 40cm x 60cm View Photos For Further Details.