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Evening Shower at Atake and the Great Bridge - Hiroshige (1858)
(upload.wikimedia.org)
The rain effect make the piece really beautiful and calming. Dare I even say that it's the best part of the piece. I wish I could see it animated and with some heavy rain sound added.
I agree, this same image without the rain is forgettable in my opinion.
Wander the gallery. Look at the art. Be polite. If you feel able please post some great art :)