A movable Desargues configuration

The Desargues configuration is an arrangement of ten lines and ten points, with three points on each line and three lines through each point. It can be drawn in the plane with every line straight. Indeed, Desargues's theorem requires that if the configuration has been drawn with nine of the lines straight, the tenth must be straight.

To operate the SVG image below, use your mouse to drag and drop any of the points. Dragging with the left mouse button and the right mouse button have different effects, but you should be able to achieve any result with just one mouse button..

As a challenge, you can try to get it to look like the image on the right.