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Glass is a block added by Vanilla Minecraft. With the exception of the imperfections that inform players it's there, Glass is entirely transparent. If Glass is built into a larger solid block (i.e. 5x5x5), only the outmost blocks will be visible. This works for any non-pane transparent block.
It is used in the crafting of Empty Magazines, Seared Tank, Seared Glass, Seared Window, Basic Glass Wall, Reinforced Glass Wall, Industrial Glass Wall, Advanced Glass Wall, Fancy Lamps, Display Cases, One-Way Glass, and it can be smelted in a Smeltery for 1000mB of molten glass which can then be turned into Clear Glass.