Dimension | thing | measure
(of physical extension) | regular object
(all right angles, same lengths) | Examples | |
---|---|---|---|---|---|

0D | point | (none) | ˙ | ||

1D | line (curve) | length | line segment | curves:
| |

2D | plane (surface) | area | square | surfaces:
| |

3D | space | volume | cube | ||

4D | can't "see" it. Exists mathematically. Each dimension is a variable, eg. time,$,calories,length,weight etc. | tesseract/hypercube | The universe (spacetime) | ||

5,6...∞ | get used to it |