Most likely, your freezer was in auto defrost mode, as the frost melted, it dripped slowly in one area and froze to this shape. The same effect is
observed at the bottom of a gutter tube when it goes from dripping to freezing, it makes the same type shape...
I was wondering if this happens for others. I have an ice maker now, or I would post pics of my own. A chemist told me this kind of ice spike usually
only happens in a quick freeze. You can see it on cars sometimes. My exes would prefer to use the spiky ice in their' drinks.
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