As a portable and quick - drying medium, it proved indispensable as a means of recording scenery and fleeting effects of light and shade observed during his extensive travels around the UK and Europe and it was in watercolour that he achieved some of his most creative and innovative results. (royalacademy.org.uk)
Graham's observations of fleeting effects in nature provided the basis for his painting. (nationalgalleries.org)
Few artists of his generation were more rigorous in observing nature, yet Cézanne was less interested in recording fleeting effects than in conveying the underlying rhythms and structures of the landscape. (nationalgalleries.org)