The Nine 103 Configurations
In a geometric 3-configuration, every line goes through three points, and three points are on each line. For ten lines and ten points, there are nine different 3-configurations. The first is known as the Desargues configuration.[more]
You can drag green points or use the slider to shift a blue point. Yellow points have positions determined by the green and blue points.[less]
 B. Grünbaum, Configurations of Points and Lines, Providence: American Mathematical Society, 2009.