Back in the late 90s @JHamlett and I saw a website for @beck and it had this mouseover imageswap thing with animated GIFs.
Ian Brown @igb
The overall effect was an full-page image (of @beck, IIRC) slowly increasing in resolution as you moved your cursor over it.
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It was such an innovative use of existing pre-turn-of-the-century web tech that it the memory has stayed with me for years...decades.