Soulé had been painting and drawing since the early 1960s when, as a boy, he was allowed to attend courses at Instituto Directores de Arte in Buenos Aires, a multidisciplinary school that his father had founded in 1959. In 1967 he moved to Europe and, in Barcelona, was accepted at Escuela Massana de Arte where he was introduced to Theories of Color based on J. W. Goethe, J. Itten and H. Hofmann and focused on the study of Gothic Art.

In the 1970s Ariel lives in Italy, a country where the complexity of art widens enormously. He studies at the Academy of Fine Arts of Brera in Milan. With his courses he developed an abstract and abstracting visual language that would provide a theoretical and practical basis for his artistic endeavors. The Academy was where Ariel studies the Renaissance, a major influence on his work. The same year he sets out on a study-journey of three months in Tuscany admiring the most impressive masterpieces.

Soulé begins to exhibit his work in important galleries in Italy at the end of the 1970s . In 1982 he was awarded the first prize of the Fondazione Michetti in Francavilla. From this recognition he is invited to participate in the New Young Artists exhibition at the Grand Palais in Paris. Exhibitions follow, outside of Italy, in Berlin and at P.S. 1 in New York.

In 1989 he was commissioned to use the Metro of Rome as the longest art gallery in the world. For this project he created works for the 42 stations of the subway system. In the next years follow exhibitions in public spaces and museums. He was invited by, curator, Renato Barilli to have a major solo exhibition at Palazzo dei Diamanti of Ferrara: Paradigma. The Museum of Modern Art of Gallarate organizes a retrospective exhibition, Mostra Antologia: 1973- 1993. The following year Soulé mounts another major solo exhibition, Labyrinthos, at the Museum of Modern Art of Spoleto, linked with the international Festival dei Due Mondi.

Ariel began a continuing collaboration with the American sculptor Simon Toparovsky in 2002, sharing studios in Los Angeles and Milan. From their work together they developed a project , Chiasmo, where painting and sculpture combine as a unique work of art. It was not long after that Soulé and Toparovsky conceived a series of installations with this work for public spaces and museums, including La Costituzione Americana in Milan, Evita's Perfect Fall in the Palazzo Comunale of Teglio, Qui, del Dicibile in a deconsecrated Gothic Church in the oldest center of Naples.