A few years ago, I actually searched around for an implementation of the classic finder, so this is very amusing for me to see actually implemented!

What I was interested in back then was the idea that there was a direct correspondence between the folder window and the data structure on the hard disk, and that to the user these concepts should be indistinguishable. One part of the illusion is that a folder always appears in the same place with the same window size, to give the sense that the folder is a tangible thing with permanence.