Atomus HD (4.5/5 stars, all ages, FREE today only), a kind of kinetic virtual plaything, is today’s Amazon Free App of the Day. If you loved Gravilux, you’ll want to give this one a try! From Amazon:
Atomus is a kinetic interactive visualizer but also it is a work of art.
Atomus was designed for helping people who want to think more creatively or who need a change of pace.
However, I believe it could be a game/ toy/ party material/ interior design element for anyone who ever loved fireworks, whirlwinds, firefly lights, aurora, rainbow, wave, mobius strip, heart or atomic symbol. I have put something in the app which remind you of those and more , but it’s intensely dynamic and also you are able to control all of those.