flowing water
My dictionary defines a rill as a small stream cut by erosion. In the practice of watershaping, however, that colorful little word has been stretched to cover manufactured channels in which we artfully move water from one place to another. These often-subtle effects have a history dating at least to the 5th Century BC, when Persian kings demonstrated their power over nature by using rills to bring water – a symbol of fertility as well as a practical means of cooling architectural spaces – from rivers and aqueducts to their palaces. These early rills were observed and adopted by Muslim designers and engineers who rose to eminence in the Middle East more than a millennium later and were carried along as Islamic influence spread through India, North Africa and, eventually, Spain, where signature elements of Moorish architecture are still seen today in the famous