Very neat. It reminds me a bit of how pages in the Talmud are laid out. From a gentile perspective, it was very interesting to me to see how hundreds (thousands?) of years of commentary are contained within the same page.

https://www.reddit.com/r/interestingasfuck/comments/1acgks3/...

https://triberuth.wordpress.com/2016/09/23/my-talmud-layout-...

Code isn't linear the same way, and pages don't make as much sense, but that idea of layers of commentary rings out in this Linux Kernel Explorer as well. I very much like the notes on the side!