Rain chain

Rain chains (, "kusari-toi" or "kusari-doi", literally "chain-gutter") are alternatives to a downspout. They are widely used in Japan. Their purpose is largely decorative, to make a water feature out of the transport of rainwater from the guttering downwards to a drain or to a storage container. (Rainwater is sometimes collected for household usage.) They can also be found on temples.
Rain chains are typically either a series of metal cups, chained together with a hole in the bottom of each, or chain links that span vertically. Rain water run-off gets distributed from a rooftop gutter downward through the rain chain.
Rain chains have also been used in the West. Nordic vernacular architecture often used a simple stick as a rainwater guide, in similar fashion. They have also been used in the Modernist era, to juxtapose metal chains with a concrete or Portland stone facade.