Would you rather draw a prune or an egg?

My art teacher asked me this question on my first day of class. He wanted to make a point about the egg's simplicity, making it appealing to draw. Mr. Haynes (Hillsdale High School, San Mateo, CA early 90's) would ask this question of new students hoping they'd choose the egg. If you choose the egg, every mistake you make will be obvious and stick out. If you choose to draw the prune, you can make mistake after mistake and no one will be the wiser.

I often think of this lesson when working on various art forms. This translates into music as well as it does hand drawing.