Ice
You have water already... and it's pretty cold. All it takes is one cold drop of liquid nitrogen added to it to turn it into one big block of ice, just like that.
ひょう
こおり
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When you think of ice, I want you to think of someone frozen with ice. Do you know anyone named Corey (こおり)? Anyone famous named Corey, perhaps Corey Feldman? Imagine this Corey person frozen solid with ice.