The “outside” is just an inside thought of an outside.

The only “outside” that exists is an inside thought of an “outside.” So when the inside is changed, the outside changes instantly...meaning everything about the outside, including the outside of the past. Immediately. 

Just like when I look at this box illusion:

I see the box closer to me on the right, then I see it closer to me on the left. Immediately. And when I do, I find that it was always possible to see it that way, I just didn’t see it that way before. There is no “correct” outside reality to it. It is entirely a manifestation of my inside thought about it. 

It doesn’t reward my thinking. It IS my thinking.

Which is why - and how - the whole thing shifts instantly the moment I think it on the right again.