Adolf Loos was a very important man who lived a long time ago in a country called Austria. He was an architect, which means he designed buildings that people can live, work or play in.
Do you know how when you draw a picture, you sometimes have to erase things and make changes? Well, that's what Adolf Loos thought about buildings too. He didn't like adding extra decorations to buildings that didn't need them because he thought it was a waste of time and money.
He believed that simple and functional designs were the best designs. Like imagine a box with just two holes for windows and a door. To Adolf Loos, that was beautiful because it served its purpose well.
Adolf Loos was also very interested in how people lived in buildings. He thought it was important to design them in a way that made people feel comfortable and secure, like having enough space for each person to have their own room.
His designs were very influential and inspired many other architects after him to design buildings that were simple yet functional. So, we can still see his influence in buildings today.