Abstract displacement
This is what happens when you start to mess with particle systems. Generate a number of entities, give them formal properties and teach them how to react to their surroundings, each other, and the user's actions. Then trace their movements with fading lines.

These images are bitmap snapshots of animation projects done in OpenGL and C++. Nerdy, but nice.

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Follow the Related Link in order to download the interactive files and see these projects in motion. The zipped files contain CodeWarrior projects (if you feel like making some changes) and the executable files (which don't need CodeWarrior).