In the poster "numbers around us", there’s a picture of Pythagoras, who discovered the theory of "everything comes from numbers", in the middle of this poster. On the left side of the Pythagoras’s head, I briefly introduce the Pythagoras' theory of “Everything is number” , as well as a pictorial representation of his other mathematical theory, it shows you both how math works in real life and math is everywhere. On the right side of Pythagoras, I tell the story of three crises in the history of mathematics. By reading the story of these crises and their solutions, you can certainly enjoy the fun of mathematics and the understanding of mathematics will also go beyond the boring addition, subtraction, multiplication and division vice versa.