Fitts' law
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Fitts' law is a law of human-computer interaction that suggests that the time it takes to reach a target using a pointing device like a mouse is influenced by how far away it is and how big it is.
Fitts' law states that it takes longer to reach a target that is smaller and/or farther away. It is faster to reach a target that is closer and/or larger.
Fitts' law can be extended to 3D.