Between 1885 and his death in 1890, Van Gogh appears to have been building an oeuvre, a collection that reflected his personal vision, and could be commercially successful. He was influenced by Blanc's definition of style, that a true painting required optimal use of colour, perspective and brushstrokes. Van Gogh applied the word "purposeful" to paintings he thought he had mastered, as opposed to those he thought of as studies. He painted many series of studies; most of which were still lifes, many executed as colour experiments or as gifts to friends. The work in Arles contributed considerably to his oeuvre: those he thought the most important from that time were The Sower, Night Cafe, Memory of the Garden in Etten and Starry Night. With their broad brushstrokes, inventive perspectives, colours, contours and designs, these paintings represent the style he sought.
The self-portraits reflect an unusually high degree of self-scrutiny. Often they were intended to mark important periods in his life, for example the mid-1887 Paris series were painted at the point where he became aware of Claude Monet, Paul Cezanne and Signac. In Self-Portrait with Grey Felt Hat, heavy strains of paint spread outwards across the canvas. It is one of his most renowned self-portraits of that period, "with its highly organized rhythmic brushstrokes, and the novel halo derived from the Neo-impressionist repertoire was what Van Gogh himself called a 'purposeful' canvas".
Van Gogh had no recollection of the event, suggesting that he may have suffered an acute mental breakdown. The hospital diagnosis was "acute mania with generalised delirium", and within a few days the local police ordered that he be placed in hospital care. Gauguin immediately notified Theo, who on 24 December had proposed marriage to his old friend Andries Bonger's sister Johanna. That evening Theo rushed to the station to board a night train to Arles. He arrived on Christmas Day and comforted Vincent, who seemed to be semi-lucid. That evening he left Arles for the return trip to Paris.
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