The manufactured material — made from silica heated to transparency — that gave human civilization windows, lenses, mirrors, and laboratory vessels: reorganizing architecture by separating inside from outside without blocking light, enabling the Scientific Revolution by making the telescope and microscope possible, and now forming the fiber-optic backbone of global communications.
Glass is the only material that lets you see through a wall. That single property — transparency — reorganized architecture, science, and commerce. The window made the modern interior. The lens made modern science. The optical fiber made the internet. All from the same material: silica, heated until it flows.