This is basically a "still-life" assignment. Take pictures of things with 3 dimensions. You'd think it wouldn't be so hard. I had some difficulty figuring out the depth-of-field techniques. The lighting techniques were much more interesting to me. (In all my experience taking pictures since I got my first camera in 9th grade, the depth-of-field in pictures takes care of itself. It's the lighting that really matters.) But, of course, since taking this wonderful photography course, I have been forced to learn many amazing and horrible things that I never thought I'd have a use for. There is a good moral here: Never Underestimate The Power Of A Crazy Professor.
See 4D Critique.