| 1 | The fourth dimension is time. | |
| 2 | This problem is specific to four-dimensional spacetime. | |
| 3 | This way you will get the glimpse of other worlds because you will be sucked in to the fourth dimension. | |
| 4 | If the universe is a four dimensional sphere, is this a metaphor? | |
| 5 | To show this diagram properly, I would really need a four dimensional screen. |