She is under our feet - at home and on the street, we see her on the facades and on the furniture. She is depicted on our clothes, and sometimes we even... we eat it: in the form of a piece of pizza or cake. Sometimes we spend our free time collecting it and getting amazing patterns. By its appearance or colors, you can identify the people who invented it. What do we mean? Mosaic, of course. And it is not surprising that this cultural artifact has become the subject of study of mathematics, which itself is part of culture.