Time flies. I still remember when I was a child, my classmates gathered together after class, holding the ready-made "East, West, North, and South". The joy this little toy brought us was unparalleled. Nowadays, many of my peers may I have forgotten how to make the little toys that I once had at my fingertips. Now, let me give you a tutorial on "East, West, North, South", hoping that together we can find the happiest version of ourselves in childhood.