The "Boy-cube".
The first implicit equation of the Boy was given by the Frenchman Apéry, who was able to reach this result because I had shown that this surface could be described using elliptic meridians. The Boy is abundantly described in my comic book "Le Topologicon" (see the "cd-Lanturlu"). I invented the "Boy-Cube" in 83. You will find all the assembly instructions in the Topologicon, page 47.