Click on the white discs or, easier, click on the wall space in front of you or use the UP key.
You will find a Mac Mouse or Touchpad an easy way to move around. But try the arrow keys as well.
A scroll mouse will allow you to zoom right in.
Depending on your set-up and the type of mouse or Touchpad, you may find the arrow keys easiest for navigating the space. A scroll mouse will allow you to zoom right in.
Let your fingers do the walking!
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Video walk through