Imagine x number of points marked on a two-dimensional plane. Now imagine a line going from every point to every other point.
Can’t visualize it? Take a look at Dikjsta’s Algorithm. Imagine the current diagram, but also with lines from point 5 to points 3, 1, and 2; from point 4 to points 6 and 1; etc..
I did it on a large sheet of illustration board, with a very fine ruling pen. The result appeared to have a lot of black concentric circles, separated by areas where some of the white showed. The hardest part was the placement of the 100 points. After that, the rest was just OCD run amok.