… the time required to rapidly move to a target area is a function of the distance to and the size of the target.
http://en.wikipedia.org/wiki/Fitts%27s_law
So for you all to remember building prototypes:
The larger or the closer the target, the faster it can be pointed to.
[youtube]http://www.youtube.com/watch?v=JUBXkD_8ZeQ[/youtube]