Naive art refers to the works of artists having no formal training or a degree in the particular field.  Naive art has a careful and simplified approach. Naive art has a non-scientific outlook and imaginary scenes are literally depicted using bright colors. It has been an international phenomenon and they started influencing from the beginning of twentieth century. Naive painters do not follow any specific movement or artistic approach. There are also few trained artists who have deliberately influenced naive style. Artist Henri Rousseau is the most famous among them.  Referring to his employment as toll collector, he is nicknamed "Le Douanier". He started painting as a free time occupation. Rousseau's painting was simple and childlike. They were brightly colored and were extremely naive. His paintings were greatly sophisticated and had expressive qualities appealing to early modernists who were searching for new varieties of expression. His painting had apparent similarity with non-Western art.