The only time of the year when one does not need to use a fast shutter speed to "freeze" a waterfall. ;oP Very cool (and I'm not being pun-ish when I say that).
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I love how the stone beneath the waterfall, carved by the water, mirrors the same shape of the falling, frozen water. And how the snow and ice near the water's edge is "bubbled", mirroring the bubbling of water in motion under the fall.
-Nik