I'm confused about how to understand the ct dimension. I cannot get passed thinking that physically real dimensions mean more degrees of motion. If a flatlander went to the store to buy a can of Coke, the closed container would be a circle. The container is closed simply because there is no 3rd dimension. As soon as the flatlander brings his circle of Coke into three dimensions, the Coke will leak out. And if we live in four dimensions, then how did we create closed containers? What is the correct understanding of the ct dimension?