Vincent Van Gogh's Painting With Tilt-shift Effect

The most comprehensive primary source for the understanding of Van Gogh as an artist is the collection of letters which were passed between him and his younger brother, the art dealer Theo van Gogh. They lay the foundation for most of what is known about the thoughts and beliefs of the artist. Theo continually provided his brother with both financial and emotional support.
Their lifelong friendship, and most of what is known of Van Gogh's thoughts and theories of art, is recorded in the hundreds of letters they exchanged from August 1872 until 1890. Most were written by Vincent to Theo beginning in the summer of 1872. More than 600 letters from Vincent to Theo and 40 from Theo to Vincent survive today and although many are undated, art historians have been able to largely arrange the correspondences chronologically. Problems remain—mainly from dating those from the Arles period. Yet during that period alone, it is known that Van Gogh wrote 200 letters to friends in Dutch, French and English. The period when Vincent lived in Paris is the most difficult for art historians to examine because he and Theo shared accommodation and thus had no need to correspond, leaving little or no historical record of the time.
In addition to letters to and from Theo, other surviving documents include those to Van Rappard, Émile Bernard, Van Gogh's sister Wil and her friend Line Kruysse. The letters were first annotated in 1913 by Theo's widow Johanna van Gogh-Bonger. In her preface, she stated that she published with 'trepidation' because she did not want the drama in the artist's life to overshadow his work. Van Gogh himself was an avid reader of other artists' biographies and expected their lives to be in keeping with the character of their art.