I have been looking at this painting by Cézanne to understand how to give trees their three dimensional form.
The large area of shadow works in two ways. It pushes the tree in the foreground towards us and sends the smaller tree across the fields into the distance. This is with very simple means, may be two or three tones of leaf green. Light falls in a column on the large left hand tree, on its leaves and on the trunk, with a shadowy gap which sets the leaves still further towards us.
It is a very unsentimental and it makes you feels as if you are standing there in the countryside.
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