In sociocultural theory, this joint, mutual focus is called intersubjectivity, or shared understanding.
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(ROOT (S (PP (IN In) (NP (JJ sociocultural) (NN theory))) (, ,) (NP (DT this) (JJ joint) (, ,) (JJ mutual) (NN focus)) (VP (VP (VBZ is) (VP (VBN called) (ADVP (RB intersubjectivity)))) (, ,) (CC or) (VP (VBD shared) (NP (NN understanding)))) (. .)))
Shared understanding is the bond between a dog and its butt.
( ( Shared understanding ) ( ( is ( ( the bond ) ( between ( ( ( a dog ) and ) ( its butt ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Shared) (NN understanding)) (VP (VBZ is) (NP (NP (DT the) (NN bond)) (PP (IN between) (NP (NP (DT a) (NN dog)) (CC and) (NP (PRP$ its) (NN butt)))))) (. .)))