Symmetry is when one side of a shape is a mirror image of the other side. Lots of buildings and everyday objects use symmetry because it looks appealing to the human eye. Watch the video below ...

The line is called a line of symmetry. This is sometimes called a 'mirror line' or 'mirror symmetry', because if you put a mirror on the line, the reflection would show the whole shape.

I SHOULD like to offer two comments on Stannard's 1 recent interesting postulate that there exists a counter-world to compensate for the asymmetries of nature that we find in our own world.