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Phase Change (xkcd)
(imgs.xkcd.com)
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For keke is water is float, but keke is something else is sink. (Other substances tend to be more dense when keke than baba).
EDIT: a bit more on-topic, Baba is You is a good example of the bouba-kiki effect; you kind of expect Baba to be round and fluffier than Keke, and that's exactly what you get.