The Actual origins of recent glass were being in Alexandria over the Ptolemaic time period and, later, in historic Rome. Alexandrian craftsmen perfected a technique often called mosaic glass by which slices of glass canes of different colors were being cut crossways to create different attractive styles. 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。 https://maps.app.goo.gl/R3XL3vjFmaK8ETpJ9