the window on the right-hand side of the composition, showing a landscape beyond the central scene, and a round, convex mirror on the wall to the left, reflecting the foreshortened figures of the players and the chessboard, distorted according to the perspective of the spectator, who would be standing facing the scene. It thus achieved the astonishing feat of integrating three planes—window, room and mirror—into one space. It was, thought Julia, as if the spectator were reflected between the two players, inside the painting.
