As with much of Lesson 2 (and as explained in the introductory video to the lesson), the goal is to introduce problems without necessarily expecting that students will be able to nail them correctly. This is especially the case with both the texture section and the form intersections, because both of these rely very heavily on spatial reasoning - the skill this course as a whole seeks to develop, and which it targets most directly through the constructional drawing exercises we perform through the bulk of lessons 3-7. All we're concerned with right now is introducing the problem so that what you learn throughout the rest of the course is pointed in a particular direction - and as you engage with those exercises in your warmups, that direction is further reinforced.

Additionally, keep in mind that in situations where a student's work isn't quite demonstrating the kind of understanding or approach that we're hoping to see, it's not a big deal. Revisions get assigned along with additional explanations, with the goal being to get you to that point. But as explained in Lesson 0 (and it's worth reviewing this video from it) you should not be trying to assess your own work or assign yourself redos on your own. That is not your job. Your only concern is to give yourself as much time as you require to absorb the information from the lesson material and apply it to the homework to the best of your current ability. It's okay if that falls short of what we're expecting, it's all part of the process.

I will give you one suggestion as you complete the remaining 3 pages of the exercise. It can be very tempting to simply trace back over the existing edges that make up your forms, to approach defining intersections as simply adding line weight, but that is not the case. As shown in the red marks denoting the intersections in this diagram, the intersection itself is a new edge that defines where, if we were running our fingers over the forms, we would go from sliding along a surface oriented in one direction, to a surface oriented in a different direction. The red line does not overlap the blue or green marks which make up either of the two forms that are intersecting.

Focus on introducing a new edge, rather than simply reinforcing those that are already present as part of the construction of the forms. It's okay (and entirely expected) for the path you define to be incorrect, but we simply want to confirm that you are attempting to introduce a new path to define that boundary between the forms as they touch.

Do your best to achieve this, and if additional assistance is required it'll be provided as part of your critique. Do not make the mistake of thinking that everything has to be correct before you submit it for feedback, as that largely would defeat the purpose of getting feedback in the first place.

I hope that I am not saying anything that contradicts what Uncomfortable has already said. The biggest revelation for me was when I realized that the boxes don't actually have a "correct" configuration. Here is a quick example I did. I first did the two center boxes at 1 with no indication of how they intersect. Then I photocopied it four times and indicated the intersection four different ways with pictures 2-5. I started with the exact same two boxes but got four different configurations. All of them are "correct" simultaneously. This is why your brain freaks out. It can see all the possibilities. I think this is because we are drawing something abstract where size and distance are not determined by the object itself. There is no external reference. If you drew two people and one was significantly smaller and overlapped by another person, your brain would instinctively know which was forward and which was back. With this exercise, you are making the decision as to which configuration you are going to show. My advice is to start by deciding on a single line of intersection. After that, the other lines are mostly predetermined. For example, in picture 4 I emphasized the top line of the box on the left. This then led to other lines emphasized and I ended up with what I ended up with. All the boxes started with a decision of which box would be forward, back or partially covered. Hope this helps.