Why is this the answer?

The answer is window because this clever riddle uses fun word pictures to describe an invention that is in every house and school. Let us break down the riddle like secret clues to see why the answer is a window. The first clue says it is an "ancient invention" that is "still used in some parts of the world today." Think about how long houses have been around. Even the very first homes needed a way to let in light and fresh air. A window's history is very, very long. People in the past did not have the clear glass we use now. Their very first windows were just simple holes or openings in the walls of their homes. Later, they used things like thin pieces of animal skin or oiled paper to cover the hole and keep the cold out. Over many, many years, people invented better and better ways to make windows, especially once they learned how to create perfectly clear glass. Even though windows have changed, their basic job is still the same, and they are used all over the world in buildings today, from huge skyscrapers to small country houses. The most important and fun clue is that it "allows people to see through walls." A wall is solid and meant to keep everything outside, well, out. If you try to look through a brick or wood wall, you cannot see a thing. That solid wall is built to protect you. But a window is a special part of the wall that is made of clear glass. It acts like a magic clear spot that lets you peek outside and see the whole world without having to go outdoors. You can watch the birds fly, see your parents drive up, or watch the snow fall, all while staying warm and safe inside. The window is the perfect invention because it keeps the bad weather out while still letting in lots of beautiful sunlight, and that is why it is the perfect solution to the riddle.