There Is No 4th Dimension

Full video: https://www.youtube.com/watch?v=M9sbdrPVfOQ I'd like to clear up a misconception: there is no fourth dimension. As a matter of fact, there is no third dimension, either. Now, by that I don't mean that there aren't three dimensions… there are, but we just can't tell these dimensions apart: there's no special direction you can call "the 1st dimension," so it doesn't make sense to say "this is the 2nd one," or "what's the fourth one?" It's like if you have a jug with three cups of water