There was no glass in ancient times, and enough paper accompanied the history of the ancients for thousands of years. In the earliest ancient times, people began tribal life, covering windows with animal fur. Before the Qin and Han Dynasties, the ancients covered windows with linen and gauze, but the cost was relatively high, and only wealthy families could afford it. Ordinary people can only cover it with grass curtains. Grass curtain has good air permeability, but poor light transmittance.
The use of enough paper can be traced back to the Qin and Han Dynasties. At first, people used rough hemp paper. It was not until Cai Lun improved papermaking that paper was used, but only the rich could afford it. But at that time, the ancients also considered the fragility of paper, so they didn't regard paper as mainstream enough. During the Sui and Tang Dynasties, a kind of bast paper appeared, which was very tough and not easy to break, but its waterproof effect was poor. In the Song Dynasty, with oil,
Then many people will also have questions, no matter how good the paper is, it will not last. In fact, the ancients were very clever. What we can think of, they have already thought of. In ancient times, in addition to window paper, the window structure also had a layer of shutters. If it rains or it is cold, the shutters will close. Some people even put curtains between the shutters, which are made of thick cotton cloth, so that they are not afraid to let go even in rainy days.
Therefore, although the ancients did not have modern technology, their wisdom was infinite. When designing a house, they will try to prevent the windows from getting wet.