Compare and contrast the various references that these artists make to the world beyond the scenes they depict? (city life, continuity with an actual chapel). Why do you think that Campin included "anachronistic" views outside the windows and doors in the Merode Altarpiece that do not describe ancient Bethleham? Why do you think Masaccio was so concerned with defining an architectural space behind and in front of Christ in the Holy Trinity? How does "illusionism" in each work of art operate to make it seem as if the religious vision is happening in real time and space?