LavaPS is an interactive process-tracking program like ``top'', but showing processes as blobs in a lava lamp. Rather than presenting lots of specific info in digital form, it tries to present certain important information in a graphical analog form. The idea is that you can run it in the background and get a rough idea of what's happening to your system without devoting much concentration to the task.
Each blob represents a process. Blob size is porportional to memory usage. Movement is porportional to CPU usage. Color is a combination of program name (which decided the hue) and time since the program last ran (which decides saturation). Basically, things that haven't run in a while are stationary and dark, while things that run a lot are bright and moving.