Pietro Perugino painted this fresco in the Sistine Chapel in Rome in about 1481. Called The Delivery of the Keys, it shows Christ giving St. Peter the keys to heaven. It is a powerful example of linear perspective, with the edges of the paving stones on the plaza serving as orthogonal lines and narrowing to the vanishing point near the doorway of the temple. Note the foreshortening of the human figures at different points in the background. (Image via Wikipedia) Read More