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250 Box Challenge
Additional Box Exercises
Listed here are a couple variations on the basic box exercise that should be left until after you're fully comfortable with constructing individual arbitrarily rotated boxes in 3D space. These modifications can help develop one's understanding of 3D space further, but if the basics are not grasped solidly enough, they will merely serve as a distraction.

Boxes on a string
I'd recommend tackling lesson 2, or at least reading the section in that lesson about thinking in 3D, before tackling this exercise.
This one's a combination of the rotated boxes and organic perspective boxes from lesson 1. Start by drawing a line that swoops through 3D space, then place boxes along it, as though they're all connected by a string and being pulled along.

Subdividing boxes
This one's complicated enough to merit a video. It discusses how we can take a box and start cutting it up into many smaller boxes. We also discuss the accumulation of errors that occurs when we approximate, and how to stay on top of them as you push through a construction, rather than trying to avoid them outright.
Sakura Pigma Microns
A lot of my students use these. The last time I used them was when I was in high school, and at the time I felt that they dried out pretty quickly, though I may have simply been mishandling them. As with all pens, make sure you're capping them when they're not in use, and try not to apply too much pressure. You really only need to be touching the page, not mashing your pen into it.
In terms of line weight, the sizes are pretty weird. 08 corresponds to 0.5mm, which is what I recommend for the drawabox lessons, whereas 05 corresponds to 0.45mm, which is pretty close and can also be used.