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There's a downside to being like the wind. When pressure systems change, you run out of breath and fade.

There's a downside to being like a rock. While everything around you evolves, you remain still, unchanged.

There's a downside to being like fire. You either consume and destroy everything in your path, or - unsustained - turn into cold ash.

There's a downside to being like water. The only way for you to become solid, is to freeze into something else's shape.