As a kid, when I used to write on white paper, my lines used to slope and I used to throw them in the trash and try again. Over time, underneath the white sheet

As a kid, when I used to write on white paper, my lines used to slope and I used to throw them in the trash and try again. Over time, underneath the white sheet of paper, I started placing another paper that has lines and a margin, so I can see through the white paper and know where exactly I should write. The result was perfectly straight lines and a perfect margin. I'm not a robot.