What feature is used to unite the interior and exterior spaces and draw the viewer into the painting in Petrus Christus's A Goldsmith in His Shop ?

Question

Quizplus · Accepted Answer

The mirror hanging in the background of the painting reflects the interior and exterior spaces, creating a sense of continuity between them. It also draws the viewer into the painting by reflecting their image and making them feel like a part of the scene.

What Feature Is Used to Unite the Interior and Exterior