In art an painting, style can refer either to the aesthetic values followed in choosing what to paint (and how) or to the physical techniques employed. An aesthetic movement - such as Realism, Romanticism, Impressionism - can promote an entire world view, a way of interpreting reality and deciding which parts of it are worth observing and/or emphasizing, as well as to what extent the artists' emotions are expressed. Some of these movements are closely associated with certain techniques, such as Pointillism, while others are more flexible, but each has a characteristic "look" that becomes more and more distinctive as it develops until it reaches a saturation point, paving the way for the next style.