Not about those “bathroom bills”

From HarveyH, who asks “Is he trying to figure out which bathroom to go to? What’s the joke?”

I think yes, to start with, he is trying to choose which one to use. So I thought this was trying for a statement on some contemporary sociopolitical issues. But then it turns into weird physics? The sign on the left keeps changing, and may reflect what happens in the room on the right; which is some kind of void or wormhole? I dunno, is that what you see too?