My name is José Luis Rodríguez Blancas. I'm teaching geometry and topology at the University of Almería (Spain).
Below is a picture of the root system of the excepcional Lie group E8 made with threads by hand! Click over the image to see it with more detail. In our blog "Juegos Topológicos" you will find more pictures of E8 and many other geometrical and topological activities.