I prefer to interpret this as "Classic" vs "New"/"Green" content; it depends a lot on the depth of stack for a given subject and how much is in the "old generat

I prefer to interpret this as "Classic" vs "New"/"Green" content; it depends a lot on the depth of stack for a given subject and how much is in the "old generation" of garbage collection. Some fields would entirely lack classic books and thus must be viewed with a wider net that includes the precursors. In that case it's obvious that the classic work of the precursors to the new language/field/idea contrast to all of the current works. In other fields there may have been sufficient refinement to include well regarded works among the classics. As a brief note: this article is the first time that I've come across the idea and I find it a refreshing proposal for expanding perspective of thought and having a rigorous world view. I do worry that in the rushed modern era there is not enough time afforded to do things the correct way.