Beyond the constructive elements of the picture, I studied the tonalities of nature by adding layer upon layer of diluted black watercolour paint. Ea… - Paul Klee

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Beyond the constructive elements of the picture, I studied the tonalities of nature by adding layer upon layer of diluted black watercolour paint. Each layer must dry well. In this way a mathematically correct scale of light and dark values is the result. Squinting facilitates our perception of this phenomenon in nature.