I'm sorry to say this, but I think in doing this challenge, you may have only skimmed the instructions, and jumped too quickly into doing the work, without necessarily having a full understanding of everything that was asked of you.

Starting with your cylinders around arbitrary minor axes, the cylinders themselves are okay (your ellipses are rather stiff/uneven towards the beginning, though this does improve throughout the set, and they're definitely more confident towards the end of this section). There are however two main issues:

• Most notably, you're not applying the error checking correctly here. At first I thought it might be because you were doing so with the same colour (black) - I strongly urge you to use a different colour so your work is easier to differentiate. Even using a pencil instead of the same pen would be a little easier to tell apart, though anything of a different colour would be better. Anyway, the instructions for this part state that you are to find the individual minor axis line for each ellipse, as shown here. Note the two separate red lines, one for each ellipse.

• Additionally, in the assignment section of the challenge, in bold, I stated that you should be varying the rate of foreshortening across your cylinders. That means that you should have cylinders where the convergence of the side edges is gradual and the shift in degree from one end to the other is more minimal, and cylinders where the convergence of those side edges is more dramatic, and the degree shift is more significant.

As a side note, based on the mechanics of how foreshortening works, you should not have any cylinders where the side edges remain perfectly parallel on the page, with no convergence at all. The reason for this is that foreshortening is the visual cue our brain uses to understand by how much the cylinder is slanted towards or away from us. The only scenario where we'd have no convergence at all in those side edges is if the cylinder were running perfectly perpendicular to our angle of sight. Because this challenge has us rotating our cylinders freely, we can effectively assume that this would never be the case, that it would never snap so perfectly to this kind of alignment.

It does see that across your cylinders, you were primarily striving to work with no convergence at all, and therefore no foreshortening.

Moving onto your cylinders in boxes, there are some other further issues:

• You should be drawing your ellipses such that they touch all four edges of the plane enclosing them.

• You appear to only be applying line extensions to 2 of the 3 sets of lines.

• In the majority of these, you're only extending the lines of the box itself, and not the 3 lines each ellipse brings to the table - its minor axis line, and its two contact point lines. You extend some of them, sometimes, but for the most part you don't. The reason we extend the ellipse's lines is that we want to test how far off those lines are from converging towards the box's own vanishing points. How close we are to doing that tells us how close the ellipse is to representing a circle in 3D space, which in turn tells us how close the plane that encloses the ellipse is to representing a square in 3D space. This is one of the main benefits of the exercise - it develops the student's instincts for constructing boxes which feature two opposite faces that are proportionally square. This goes back to the first issue I pointed out for this exercise - ensuring that your ellipses touch all four edges of the plane enclosing them is necessary for this to work.

Given that you've missed so many key aspects of this challenge, I am unfortunately going to need you to do this again. Please read the instructions more closely, watch the video, and if you have any questions, ask the folks on the discord server.

When you're done going through the challenge again, you'll need to submit it again as a fresh submission, which will cost you 1 credit. That said, you may instead want to finish up your Lesson 5 submission (back in November I asked for revisions) - though please make sure that you reread my feedback carefully, and that you go through the lesson material again to refresh your memory, as it has indeed been a long time.