Everybody I know, when visiting Japan, remained fascinated by these items.
In place of a straight gutter, a chain made of tens of small bell like copper cups conveys the rain to the floor. The rain can be discharged into a regular stormdrain, collected in a large pot or drained directly in the soil, having the care of digging a small pit and fill it with gravel.
Japanese copper rainchain:
Stumble It!
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