When There is one point it is 1-D,
When it is Extended with 2 fingers simply, it forms 2-D,
When Plane (2-D) is extended lateraly it forms a cube(i.e. 3-D)
Similarly 4-D and 5-D can be made, but it is impossible for us to imagine because
"WE THINK OR INTERACT BY WHAT WE SEE "
