You have to draw the cross section of the duct tape (out, up, in, down) but you segment it and alternate each segment by going around the tape roll.
The final sequence is something like: (around/out/around/up/around/in/around/down/repeat)
The purpose of this exercise is to task you with drawing in perspective while also having to parallel-process the sequence.
Ideally, you do this without guidelines (second image) because if you draw guidelines it solves the problem of maintaining the perspective and volume of the tape roll.
I’ve been doing this for quite a while and even though I have a pretty good handle on the perspective and sequencing, the segments are pretty irregular and there’s a lot of drift. The bottom inner circle suffers the most drift because I can’t see through my own hand.
The third image is a beginner-level sequencing exercise. I designed sequencing exercises to train students to slow down, think about where their next line should be targeted and carefully aim.
All of these exercises(with the exceptions of the guidelines) were performed without lifting the stylus. It’s OK to pause and hold your pen in the same position when thinking about where to go next, in fact, I encourage it.
Ultimately, you trade off speed for accuracy and methodical precision, but when you get comfortable with it, speed eventually comes back.
When you make hard things easy, then you’re easily doing hard things.