Finger movement in a circle on the lower screen button; What purpose does this provide?

When you move your finger in a counter clockwise around the button, it lowers the screen to halfway... you have to make sure to quickly... somehow I can't find any purpose for this.  Someone knows what you can do with it once it lowers the screen?

Which makes applications easier to achieve when you use only one hand to hold the phone and access applications.

Tags: iPhone

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