Is Glass a Liquid?
3. Used to be Expensive
One thing you might notice about some old buildings is that there are no windows. This would obviously cause buildings to become very cold in the winter and, sometimes, wooden shutters were used to help keep the cold out. In some cases, alternatives like flattened animal horn were used.
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The simple reason for this is that glass used to be very expensive; only the very rich could afford it. You might also notice that windows were made up of multiple smaller panes of glass, and this was because older methods could not make larger, single panes. Thankfully, our technology has advanced to the point where windows are now easier to install and affordable.
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