Starting with your form intersections, overall you're doing pretty decently here, although one thing that stands out is the fact that you're not necessarily taking all the time you could be to ghost each line, so some of your lines do appear just a touch hesitant and stiff, and also throwing off some of the accuracy of your box constructions. There are also some gaps, especially in the corners of your boxes, that can undermine the solidity of those forms.

I did catch a couple small mistakes, which I marked out here. The main one of interest is with the two cylinders below. It's actually the exact same kind of intersection that you had between the sphere and cylinder towards the center. It comes down to determining the main axis of curvature for the surface, and then kind of doing a bit of math - if each cylinder has a simple curve denoted by a C shape, then when you add them together, you'll get an S curve. This doesn't tell you much about where to draw the S, but knowing that it's going to look like an S does help. From there, studying the curves (where I marked out the arrows), you can see how I transition from following the curvature of one cylinder, then the other, and back to the first.

Continuing on, you're doing a decent job with your object constructions although there are some things I want to draw your attention to:

• Perhaps most notably, your initial boxes - the bounding boxes you start your constructions with - definitely have room for improvement. If you were to apply the line extensions from the box challenge, you'd quickly notice that yours do get a little wacky at times. For the bluetooth speaker, they're definitely diverging downwards, for instance. In general, I think setting aside some time to practice your freely rotated boxes (along with the line extensions), and specifically thinking more about how every edge in a box belongs to a set of 4 that is meant to converge together will help.

• When I give students the option to use a ruler for their straight lines, it isn't a mercy, and shouldn't be seen as such. I noticed that you are indeed freehanding your lines (and in many cases, quite well - though not always), and not using a ruler. This means that a portion of your brainpower is going to drawing the lines. That brainpower could be spent instead on determining how your lines ought to be angled in order to converge more consistently with one another, among other things. Using a ruler would definitely have freed you up to sure up other weak points, and to focus more on the core of this lesson. Sometimes students approach this with the misconception that freehanding their lines here is even better, because it'll help them keep those skills sharp. While it certainly will do that, everything comes at a cost, and if you're concerned with your linework, there are loads of exercises we've introduced in this course that will do an even better, more targeted job of that. And of course, they should constitute part of your regular warmup routine.

• A few things about your fridge - the box itself is definitely wonky, but where in other cases you stuck to what you'd drawn and kept working with it (which is the correct response, and I was quite pleased that you did so), here you did seem to try to correct the issue, drawing more attention to it. Additionally, the handles on the fridge doors appear to be drawn flat, like paper ribbons, with no side plane being implied by their silhouette. Always remember that - objects have thickness, and introducing a little corner to their silhouettes will help you imply the fact that they're 3D without exerting too much more energy. Here's an example of what I mean. Lastly, don't use hatching. Stick to solid black and white - so if you want to cast a shadow, fill it in with solid black.

• To that point, remember that in our drawings throughout this course, we're basically reserving our solid, filled black shapes for cast shadows only. So for example, in your USB drive, it'd be something like this. The solid half stays blank, and assuming that's the top section, it'd cast a shadow down into the empty section - though not fill it in.

• The last thing I wanted to call it is basically that your computer mouse, where you used your own mouse but applied the techniques from my demo video, was very well done. Aside from being just a little quick in drawing some of your strokes and having them come out a little sketchy (just barely), it's really quite well done. Conversely however, the game pad that follows it is considerably more complex, and relatively similar in that it's a fairly unique, somewhat organic form, appeared to be given far less consideration and time in its construction. Where in the mouse you broke things down more extensively, in your gamepad you drew a box, then constructed the rest of the controller inside of it more or less from observation. All things considered, you didn't do too badly - but as far as this course goes, that's not what was asked of you. You should not, at any point, be making such leaps of complexity without the appropriate scaffolding to support it. You should be striving to pin everything down with precision and specificity. That means figuring out exactly where everything's going to go, encapsulating your buttons and joysticks in boxes, then cylinders, etc. Use all the tricks and tools you've learned to build it out - don't just draw what you see. This whole course, every drawing within it, is ultimately about understanding how the things you draw exist in 3D space, and how they break down into simple components.

I've outlined a number of things for you to work on, but I think the mix of strengths and weaknesses are pretty normal for this stage. You will indeed have a lot to develop further by the time you hit lesson 7 - but there's still some time yet. I'll go ahead and mark this lesson as complete.