Very nice work! I'm extremely pleased with the how clean, precise, and purposeful each mark is, and with the care with which you've tackled analyzing your results to identify where your weaknesses lay. I do have a couple points to remark upon, but all in all you've done a good job.

The first issue I'm noticing is just that you haven't really attempted to vary the rate of foreshortening in your first set of cylinders, as requested in bold in the assignment section. The reason I want students to delve into a lot of different rates of foreshortening (from dramatic to shallow) is to identify whether they truly understand the ways in which the ellipse on either end will change based on whether we're applying very dramatic foreshortening to a form, or if we're applying shallower foreshortening.

The key thing to know here is that foreshortening is made present in two ways:

• The rate at which the overall scale of the far end shrinks relative to the closer end - basically what we traditionally know as the core rule of perspective, that which is farther away appears smaller.

• The rate at which the degree of the far end widens relative to the closer end.

Both of these things occur at the same rate, so having you do a variety of more dramatic and shallower cylinders helps highlight cases where one might be drawing a significant shift in degree, but a minimal shift in scale, or vice versa. Both of these would suggest a contradiction, where one claims there's lots of distance between the two ends of the cylinder, and the other implies that there is very little.

Continuing on, you did a great job with the cylinders in boxes, and I can see that your ability to estimate proportions for the boxes that have two opposing ends come out as roughly square has improved a fair bit. That is at the core of this exercise - by introducing the ellipses and its own line extensions, we're able to test whether those faces are proportionally square, and gradually train ourselves to adjust our approach such that the line extensions fall closer in line with the box's own vanishing points. It's essentially an extension of what we learned in the box challenge, and while there's still room for improvement, it should help you have an easier time throughout lesson 6.

So, I'll go ahead and mark this challenge as complete. Keep up the good work.