Muuto Cat Dome
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The Muuto Cat Dome is a habitat for your pet cat and goldfish to interact with each other. The ultimate entertainment for a cat is a moving creature, and the ultimate entertainment for its owner is seeing this playful interaction. (from)I can't tell if it is intended to be real or a joke, nor if an actual cat would love or loathe it....
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I believe the cat would love it. As would the owner -- for about 45 seconds until the cat, in its attempts to capture the fish, knocked hard enough on the side to knock the whole shebang over...