Explaining the ideas of balance
The original has an image and explanation (see first bit under "balance"), which seems like it would be helpful in learning about visual balance. The end of the paragraph even says: "Refer to these six diagrams when you are determining the visual weight of specific artworks." The image is not open copyright, but seems like something similar could be created to exemplify the concepts.
I'm leaving a note here so we can work on this later.