Edges and Depth

Okay, I'm not gonna lie - I saw this painting and wondered why anyone would paint something this ugly.

(James Gurney, Giant Rodent, 2009)

But on the topic of edges and depth, this painting is a good example of focusing in on an area by making the lines crisp and defined. Gurney explains how artists tend to make every area in a painting crisp because we look around and our eyes refocus on every detail. However, in reality our eyes (and cameras) choose an area to focus on, and leave everything else more or less blurry.