Bowl 8th-9th century Wheel-cutting was one of the most important contributions of early Islamic artisans to glass-making. They would first blow an object with thick walls that could withstand the pressure of the wheel, then cut away the glass, creating a relief decoration, such as the flutes inside the lobes on this vessel. Such lobing was characteristic of Bactrian and Sasanian silver vessels, an indication that artists translated models derived from metalwork in other media.. Bowl. 8th-9th century. Glass, colorless with greenish tinge; mold blown, cut. Attributed to Iran. Glass