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After reading your description, a website comes to mind that might be the one you're looking for. The website is Koalas to the Max, here is the link: https://koalastothemax.com/. It doesn't exactly match your description, but it does feature an interactive element where moving your cursor creates circles that split into smaller ones, revealing a hidden image.
Sure here it is
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.