Proprioception.

The activity of proprioceptors; the perception of the position and movements of the body.

Is often described as a “sixth sense” or the “eyes of the body”. It’s an essential, often subconscious, ability that allows us to move without constantly needing to look at our limbs.
Cleveland Clinic.

The actor uses and develops proprioception while acting in front of a camera relating the actual space they are in with the space photographed in the frame.