Discussion of theories involving time as a dimension, time travel, relativity, branes, and so on, usually applying to the "real" universe which we live in.
I don't see much that could be done about it. They are excluded from physics because no such paradox has ever been observed by physicists. That might change some day. Who knows?
Carl Jung observed something of that sort late in life. He went with a friend and saw a mural. Later he contacted the mural site, who told him that that mural hadn't existed for years. Both Jung and his friend agreed on what they had seen.