## Explanation

This example shows the identity function, i.e. **f(z) = z**. You can also alter the "zero" of the function,
i.e. to show a function **f(z) = z - a** for arbitrary **a**.

The identity function is not enormously interesting, however, it serves as a useful reference point,
to help understand the color scheme for the domain colouring, and also to understand the representation of **f(z)**
on the subset of the domain represented by the white circle.

Last updated: 21 May 2013