How does my dog know to look at my face?

[StepBangin]

Serious question.

Im just sitting here on the computer and the dog is staring at me because she wants to go outside.

It got me thinking, how does she know to look at my face when she wants something or when she is just looking at me for no reason? Why doesnt she stare at my knee caps or my back?

Is it because the sound comes from my face so its just natural to look there?