People who seem to have nothing in common .......
... "The luthier Max Möckel, who worked at the end of the 19th century in St. Petersburg and Berlin, did not rest until he had investigated the true origin of the architectural and sonic beauty of the violin. His idea was to investigate whether, in the light of knowledge of the Renaissance, it might be possible to discover what role Leonardo da Vinci, Luca Pacioli and Alberto Durero had played in the instrument construction revolution, so he began to look for clues to support his hypotheses in the works of these great artists, and he came to The following conclusion:
Is there really an Italian secret? Yes and no. If we think of this as some kind of recipe, hidden somewhere in an old trunk, then no. . . We must move to the time when the violin was invented, and to the ideas with which the old masters created their works. . . The most important minds, to name two of them, Leonardo da Vinci and his friend Luca Pacioli, had been interested shortly before, in their work of so many facets, in mathematical problems, and when they saw the triangle and the pentagon, they did not see them merely as simple geometric figures, but they saw in the pentagon, for example, the secret eye of God, a living sensitive image, with its infinite number of relationships, for all that is appropriate.
With this hypothesis as a starting point, Möckel developed a procedure to build the violin, the viola and the cello, whose model was what Luca Pacioli called the divine proportion (in the divine proportion, the division of a line or a geometric figure is such that the smallest dimension is the largest, as the largest is the whole). Since then, he built many excellent instruments with this method. "