Each of us has heaven and hell in him
― Oscar Wilde

 
"One Sky" presents a kind of circular window from which two faces of two different ethnic groups emerge in said heaven. 
They coexist peacefully under that single sky that falls equally on them.
Both faces look into each other's eyes as if each of these people were approaching a mirror and reflected there, since their gaze finds a human being exactly the same, with whom they share an important portion of that being within.
The part of the human figure selected to be the central part of the artwork, as its simplicity evidenced by an absolute lack of stereotyping, gender or period, allows us to imagine any gender for these people, as long as any of them could be validly assigned.
Both figures are joined in exterior lines from what emerges from their interior, intertwining the same towards the outside of said window in a sort of commutation.
The only sky that shelters them not only passes through them as it falls on both of them, finding their reflection in someone different but the same.