Fitts' Law: http://en.wikipedia.org/wiki/Fitts's_law: "the time required to rapidly move to a target area is a function of the distance to the target and the size of the target". Further target requires more time, wider target requires less time, but the relation is not linear, rather Logarithmic. I found this link in wikipedia: http://www.particletree.com/features/visualizing-fittss-law/ that visualized Fitts' law with simple understandable figures: http://www.particletree.com/features/visualizing-fittss-law/
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