I've read the explanation from the guy who started the site. He said his kitten was in the habit of climbing into any small enclosure it could find-- universal cat behavior, in my experience. When he saw the kitten smooshing himself into this glass jar, he took some "awww, cute" pics of it, and on further reflection, the image brought to mind this "bonsai kitten" concept. He slapped up a website, never suspecting that anyone would take it seriously.
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What others say about boorite!