Today's curiosity: Why ice makes a spike when it freezes?

Let's go to an expert for this curiosity solved. Unofficial Dr. Freeze, Professor Stephen Morris has a self proclaimed obsession with icicles. One could be guilty of worse things and coupled with my obsession with wintertime I could be a distant cousin in science family tree terms. He's even created The Icicle Atlas.  He can legit answer this ice spike question of mine.

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