> Sadly, I mostly dislike tree maps. At large, I never actually see the tree structure that they are supposedly helping me see.
I think the tree map examples in the article are missing the padding that you would add to every layer. Apparently, I didn't find any good examples with a quick search. I think this is a crucial feature of tree maps.
Padding in tree maps lets you extract the exact tree structure from the visualization as every layer is shown in a visible box. So it makes the visualization more useful. I found an example of such a tree map here [1].
I think the tree map examples in the article are missing the padding that you would add to every layer. Apparently, I didn't find any good examples with a quick search. I think this is a crucial feature of tree maps.