 He found olive trees , representative of Provence , both " demanding and compelling . " He wrote to his brother Theo that he was " struggling to catch ( the olive trees ) . They are old silver , sometimes with more blue in them , sometimes greenish , bronzed , fading white above a soil which is yellow , pink , violet tinted orange ... very difficult . " He found that the " rustle of the olive grove has something very secret in it , and immensely old . It is too beautiful for us to dare to paint it or to be able to imagine it . " 
