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. Major series Van Gogh's stylistic developments are usually linked to the periods he spent living in different places across Europe. He was inclined to immerse himself in local cultures and lighting conditions, although he maintained a highly individual visual outlook throughout. His evolution as an artist was slow, and he was aware of his painterly limitations. He moved home often, perhaps to expose himself to new visual stimuli, and through exposure develop his technical skill. Art historian Melissa McQuillan believes the moves also reflect later stylistic changes, and that Van Gogh used the moves to avoid conflict, and as a coping mechanism for when the idealistic artist was faced with the realities of his then current situation. Portraits Van Gogh said portaiture was his greatest interest. "What I’m most passionate about, much much more than all the rest in my profession," he wrote in 1890, "is the portrait, the modern portrait." It is "the only thing in painting that moves me deeply and that gives me a sense of the infinite." He wrote to his sister that he wished to paint portraits that would endure, and that he would use colour to capture their emotions and character rather than aiming for photographic realism. Those closest to Van Gogh are mostly absent from his portraits; he rarely painted Theo, Van Rappard or Bernard. The portraits of his mother were from photographs. Van Gogh painted Arles' postmaster Joseph Roulin and his family repeatedly. In five versions of La Berceuse (The Lullaby), Van Gogh painted Augustine Roulin quietly holding a rope that rocks the unseen cradle of her infant daughter. Van Gogh had planned for it to be the central image of a triptych, flanked by paintings of sunflowers. Self-portraits Van Gogh created more than 43 self-portraits between 1885 and 1889. They were usually completed in series, such as those painted in Paris in mid-1887, and continued until shortly before his death. Generally the portraits were studies, created during periods when he was reluctant to mix with others, or when he lacked models, and so painted himself. The self-portraits reflect a