It can't pretend. It just does what it does. Simple, but entrancing. And freakingly relaxing.
Freak Flag Spring Thing is an immersive app showing fascinating patterns arising from a simple 2-D spring-mass simulation, and the trail it leaves behind.
Swiping your finger across the screen starts the movement leaving behind a mesmerizing trail. Add a twirl as you swipe to add a rotational component to the movement. Or simply shake and tilt your iPhone and let the accelerometer generate its movement.
Freak Flag's Basic Set comes with 3 configurations: "Jerry", "Comet", and "Sparkles". Buy the Extended Set to get many more configurations. And buy the Full Capabilities to get all of that plus the ability to modify many other settings, create your own configurations, and even share with your friends!
By some estimates there are 275 billion different configurations possible. Try one!