Pie screen

[methodman89]

I updated today and while tapping around, found the following, which moves in a spinning way, filling out the whole screen . Each time it's a different set of colors. Go to software update information and tap 3 times. Galaxy 9+,1ui

 

[Rukbat]

It's called an easter egg, and there's a different one in each version of Android.

 

[B. Diddy]

My favorite one from recent versions is the Oreo octopus. https://www.androidpolice.com/2017/...-easter-egg-features-octopus-floating-around/