Not really. "Framing" is an important consideration-- ask any photographer. I wish the author had gone into other kinds of framing (not just rounded corners), but it's a start.

"For the interested reader", see different kinds of framing in the Path app: http://a3.mzstatic.com/us/r1000/067/Purple/v4/2c/81/7e/2c817... There's color, drop shadows etc.