The True origins of contemporary glass have been in Alexandria through the Ptolemaic time period and, afterwards, in historic Rome. Alexandrian craftsmen perfected a method called mosaic glass by which slices of glass canes of different colours had been Reduce crossways to make diverse ornamental patterns. 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 Top https://maps.app.goo.gl/R3XL3vjFmaK8ETpJ9