In 1958 Giovannetti wrote, in collaboration with Clive King, the volume Hamid of Aleppo and he also produced the illustrations. His work as an illustrator was released by the New York-based publisher Macmillan and was also published in popular newspapers and magazines such as "The Washington Post", "The Herald Tribune", and "Punch". At that time, he signed his work as Giovannetti or Pericle Giovannetti. The books with the adventures of Max, and of other characters as well, were reprinted several times in Germany, France and the United Kingdom. In 1959 Giovannetti, signing himself Luigi Pericle, began a collaboration with Peter G. Staechelin, an art collector from Basel, who acquired several of the artist’s works for his own collection. In 1962, Giovannetti met Martin Summers, gallery owner and curator at the Arthur Tooth & Sons Gallery in London, where the painter held two solo exhibitions, in 1962 and 1965, and two group exhibitions – Colour, Form and Texture and Contrasts in Taste II – both in 1964. In 1963, some works were also exhibited in Ascona at the Castelnuovo Art Gallery. Giovannetti met Hans Hess, museologist and curator of the York Art Gallery. In 1965, Hess organized an itinerant solo exhibition, displaying a selection of 50 works, in several British museums, including: York, Newcastle, Hull, Bristol, Cardiff and Leicester. In January 1965, Herbert Read – art critic, co-founder of the Institute of Contemporary Art in London and artistic consultant for Peggy Guggenheim – visited Pericle’s studio in Ascona. Later, he curated the second solo exhibition of Luigi Pericle’s work in London and wrote the preface to the catalogue that would afterwards be included in the book "Luigi Pericle: dipinti e disegni" (Luigi Pericle: paintings and drawings). From the 1960s to the 1980s, the artist produced a series of works on canvas and masonite, inks and drawings. During this period, the "Luigi Pericle: dipinti e disegni" (Luigi Pericle, paintings and drawings) catalogue was printed: the project of a monograph devoted to the artist was initiated in collaboration with Staechelin and, after the latter’s death, was completed with his son, Ruedi Staechelin. The paintings by Luigi Pericle are now part of the Municipal Collection of Ascona, the permanent collection of the Bristol Museum & Art Gallery in Bristol and the permanent collection of the York Art Gallery Museum in York.