(There's no video for iMac (first gen) foldable paper model yet. Please contribute to MR and add a video now!)
This cut and fold paper model was featured in many end of 1998 to early 1999 magazines to promote the new iMac that had just came out.
See more foldable paper models (including other Macintosh computers) from the same artist: https://web.archive.org/web/20010607003310/http://www.md.xaxon.ne.jp/~mitsuaki/pcraft/index.html
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iMac cut and fold paper model / PDF document
Emulating this? It could probably run under: SheepShaver