what is CRT animation?

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I see it in every ROM thread but i have no clue how does it looks like and what it is suppose to be

http://www.youtube.com/watch?v=-Lv1p4TvRw4

It is beyond our mental capacity to truly understand what it is. It is the FUTURE.

This is more info then you're asking for, but CRT stands for Cathode Ray Tube. Any TV or Monitor that's not a flat screen (which is making me feel really old all of a sudden) used vacuum tubes and scanlines instead of individual pixels, and these tubes needed to be warmed up before they could turn on. That's why on older TVs you'd often turn them on, hear the sound, and then the picture would slowly fade in from black. When you turn them off, then, the picture kind of zaps out of existence, because it's an analog signal, instead of any LED or LCD screen, where all of the pixels are shut off instantaneously. The CRT animation mimicks that effect when you turn the display off on the phone.

Unrelated sidenote: How fun was degaussing CRT computer monitors? I remember I would wait weeks at a time to get a whole lot of magnetic buildup, and then when I finally hit the button and the picture shuddered back to life, I thought it was the coolest thing in the world.