  This is an introductory article about the Boy surface. Boy found 1901 that
$\mathbb{R}P^2$ can be immersed into $\mathbb{R}^3$, and published it. (The
image of) the immersion is called the Boy surface after Boy's discovery. We
have created a way to construct the Boy surface by using a pair of scissors, a
piece of paper, and a strip of scotch tape. In this article we introduce the
way. Furthermore, we make a movie to show the paper-craft actually, and put it
in a website. One can find the website by typing in the author's name or the
title of this article in the search engine.
