Really thought your link was going to be "draw the rest of the owl"
https://i.kym-cdn.com/photos/images/newsfeed/000/572/078/d6d...
What's even funnier is that I've actually read a math textbook that quite literally did this exact thing.
Textbooks should really be tested on a diverse audience with N>10, and then the feedback should be incorporated back into the text, and then another N>10 test should be done if necessary.
https://i.imgur.com/gAtCJFz.jpeg