I recall a fascinating lecture given by Professor Enrico Bellone. In a letter dated May 7th, 1952, addressed to his friend Maurice Solovine, Einstein shared a drawing that summarized his ideas on the subject: "What is science ?". The drawing features a horizontal line labeled E, which represents immediate experiences or the empirical basis, and a vertical line labeled A, which represents the axioms underlying theories. Einstein argued that there is no logical process that allows us to derive axioms from experiences; instead, it requires an intuitive, extralogical, and psychological leap. Once we have intuited the axioms, we can deduce special statements S1, S2... by assuming their truthfulness and then comparing them with experience. According to Einstein, the crucial level lies in the axioms, and therefore there is no distinction between science and philosophy, but rather a single set of concepts. He also maintained that the theoretical principles of scientific theories are fictional, and any attempt to deduce ideas and laws from elementary experiences is doomed to fail. So, what is science according to Albert Einstein? Einstein believed that all the games are played at the top of the drawing, where we jump from one idea to another, from one theory to another, and where we model nature because we have categories of ideas that are fairly standard. In this context, Einstein praised the great philosophers he admired.