Hi! This thread has been edited, so some of the comments below won't be for this idea.
A man who is in another universe, but we can see him here. He would be a Euclid, because he can go anywhere he is in his universe, and if someone accidentally walked through him somewhere, it would be a security risk.
If you just encounter him for a relatively short time and a safe distance, you'll be okay, but if you are in a close proximity for an extended period of time, you will slowly be drawn into his universe. If you get far enough drawn in that he can see and interact with you, you've reached the point of no return.
So what do you guys think?