Aqua-era OS X is the best looking out of the box desktop environment in the entire history of computing, and given 1) the lack of interest everyone seems to have in the desktop these days and 2) the directions in which the few remaining contenders are headed, I wouldn’t be surprised if it remained that way for a long time.

It’d be fun, as a side project, to build a pixel perfect replica of it (along with the core apps that make it useful) that runs on a modern Linux kernel and preserve it in amber forever.