The Chaos Game- Sierpinskis Triangle
^^^Click the link above, explains the process really well.^^^
Press 1 to move Point A to your cursor, press 2 to move point b, press 3 to move point c, and press 4 to move the starting point.
Press space to start the program. Starting from the starting point, the game picks one of the three points, at random, and moves halfway towards it, Then it moves halfway towards another point. Every iteration draws a dot, and soon something amazing happens.