"The colour blue - that is my colour - and the colour blue means you have left the drabness of day-to-day reality to be transported into - not a world of fantasy, it’s not a world of fantasy - but a world of freedom where you can say what you like and what you don’t like. This has been expressed forever by the colour blue, which is really sky blue."

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Water 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