> 
> **Do we have both the usages of inside-out and outside-in?**
> 
> 
> 

**inside-out** means: with the inner surface turned outward.

So basically they are the opposite meaning? Perform inside-out and then perform outside-in on an item A, then I suppose geometrically that we can turn A back to A itself?

And can we call this process of inside-out and outside-in as the $2\pi$=360 degree self-flipping?

Thanks.