Early on in his career, Molinari was influenced by several ideas of the Automatism movement. The spontaneous gesture plays an important role in his first stain or tachism art at the beginning of the 1950’s. Later on he designed a series of black and white paintings that were, at the time, considered to be radical and that marked the beginning of what were to be his later works. Artistically he then moved closer to the ideas of Les Plasticiens and began to incorporate structural elements in his paintings. He drew his inspiration from plasticism for Vertical horizontal blancs (1960) and Opposition rectangulaires (1961) which were also influenced by the works of Piet Mondrian. From 1963 to 1969, he produced various hard edge serial paintings of color stripes including Mutation rythmique bi-jaune (1965) and Sans titre (1966). In later years he created checkered paintings using triangular forms for Diptyque I Ching (1970) and Triangulaire ocre-jaune (1974) for example. In 1975 he began producing large monochrome paintings and mural installations entitled Quantificateurs and continued to experiment with this style in his later paintings.