Although White and White concentrate on the structure and functioning of the French Academy which worked in combination with the large number of artists in Paris in the last half of the nineteenth century to facilitate the rise of dealers, they recognize the importance of several other factors involved in the rise of Impressionism These include the rise of middle (society node) and the increase in the size of the art buying public (audience). As the audience grew, it also changed in composition, which had implications for the styles of paintings art audiences might prefer to buy. The availability of oil paints in tubes and ready-made canvas (materials,as part of the creator node) made it easier to work outdoors.