The image is a photograph of a sign in a museum exhibit. The sign is written in Hebrew and is displayed on a white wall. The text on the sign reads "When glass is heated, it becomes increasingly malleable. It can then be manipulated in a vast number of ways, and it will retain its shape even after it cools and hardens. This seemingly magical quality finds its fullest expression in the technique of glassblowing, which took some 1,500 years of working with glass to discover. The discovery of glass blowing was the most important breakthrough in the history of glassmaking. It took place in the first century BCE, somewhere on the Eastern Mediterranean shores. Most of the first blown-glass vessels were still being produced at the time, and the core-formed vessels, which were still used in glassmaking, were still produced by the time. It was only after glass blowing, and was well established and crafted by other large, everyday vessels began.