1) Emulate a tide 2) Regular fluctuation
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https://www.crosswordclues.com/clue/ebb-and-flow
[mural] Ebb and Flow, is a public mural by American artist Douglas David, located on the exterior of the Consolidated Building in downtown Indianapolis, Indiana. It was painted in 2006 by David using exterior house paint. The mural, which is painted over five wood panels, covers windows of an un-used storefront. Painted in 2006, Ebb and Flo...
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http://en.wikipedia.org/wiki/Ebb_and_Flow_(mural)
Ebb and flow (also called ebb and flood and flood drain) is the movement of water, often in relation to natural tides. The term is also commonly used metaphorically. ==In Hydroponics== Ebb and Flow is a form of hydroponics that is known for its simplicity, reliability of operation and low initial investment cost. Pots are filled with an inert medi...
Found on
http://en.wikipedia.org/wiki/Ebb_and_flow
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