This shows "that there is a real ... of life, which is based on the assumption that the molecules that gave rise to life were formed through the spontaneous desymmetrization of symmetry.

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.

To win the Symmetry Medal, Ethan has to be able to find the line of symmetry on an object and karate chop it down that line. Like that. Well done Ethan. VO: The line of symmetry is the imaginary ...