In the end nobody knows how it's done โ how art is made. It can't be explained. Optical devices are just tools. Understanding a tool doesn't explain the magic of creation. Nothing can.
David HockneyWater in swimming pools changes its look more than in any other form its colour can be man-made and its dancing rhythms reflect not only the sky but, because of its transparency, the depth of the water as well. If the water surface is almost still and there is a strong sun, then dancing lines with the colours of the spectrum appear everywhere.
David Hockney