It only seems that way because in my bubble I have a picture of me here and you there, while in your bubble you have a picture of you there and me here. The pictures in our two bubbles are so similar that we assume that we are in the same space.

But then where are these bubbles? What are they made of? And whatever happened to the real world that we know exists independent of our experience of it? Where did it go? Does it not even exist? Is everything just a hallucination or lucid dream?