Note the automatic color scaling. A zoom to 200 iterations. Notice seven-fold symmetry. These images were generated with a program which calculates a projectile's motion by an iterated simulation. It uses a gravitational attractor that can both pull, like normal gravity, and also push.
Color indicates how close the projectile came to the target.
However, I needed to do that because else these images would not be on this web page. They would still be generating themselves on some poor computer somewhere. This is an image with one gravitational source that pulls in the projectile. Just thought that I should throw in one of the plain-vanilia simulation results image. One last thing.