Twister is a free app available on Android that promises to give you the perception of objects warping before you in a matter of seconds. The app projects a moving image on the phone's display, and after staring at its center for half a minute, you may experience the effect once you look away. The app features an animating psychedelic hypnotic pattern that may trick your eyes and appear to breathe, shrink, and expand. It can distort your vision and make you hallucinate after watching the optical illusion for 30 seconds.

However, it is important to note that the app may cause dizziness after prolonged use, so it is advisable not to overdo it. The app also comes with a warning not to continue if you are uncomfortable when exposed to flashing lights. To make the app free, a shortcut icon is created on your home screen, and notification ads are displayed very rarely. The permissions needed are for the ads, and you can opt-out of the ads notification anytime to enjoy the app normally.

Overall, Twister is a fun app to play around with, but it is important to use it in moderation and take necessary precautions while using it.