This was fairly cutting edge around 98 or 2002 when I first saw it. Really clean.
Not sure how any of the levitated Flash content can be shown now, but it appears that the creator Jared Tarbell is creating new works at infinite.center under MIT licence.
These look to be some of the best digital artworks available today.
I recommend Ruffle for viewing Flash content in the modern day. It aims to be a full reimplementation of Flash in HTML5, available as a desktop app or browser extension. It's still in beta, so it can't play all flash files yet, but it works great for the vast majority (it seems to work for all the animations on that site). It even works on mobile.