If you want to break down Part 2, you might consider at least separating between historical pieces (from outside Japan) and more contemporary pieces, with the latter including those introduced on this site.
Oh, and if you haven't already, you might take a look through the Piece of the Day that I've been posting via the Comments section of my own profile over the past few months, and the additional stuff on my Thingiverse account. My own creations may or may not be noteworthy (most likely some are, and some aren't), but you should still find interesting stuff.
If you want to break down Part 2, you might consider at least separating between historical pieces (from outside Japan) and more contemporary pieces, with the latter including those introduced on this site.
Oh, and if you haven't already, you might take a look through the Piece of the Day that I've been posting via the Comments section of my own profile over the past few months, and the additional stuff on my Thingiverse account. My own creations may or may not be noteworthy (most likely some are, and some aren't), but you should still find interesting stuff.