It is entirely possible (unfalsafiable) that our universe has a 4th spatial dimension that humans are capable of observing and interacting with, and through hypnosis we are completely unaware of this. It's possible there is a group of humans who have hypnotized the entire rest of the human population into being completely unaware they exist. Everyone could be indoctrinated into this and indoctrinate others and have absolutlety no recollection of doing so.