"Perversion may be found in strips (...) it's inherent to the form (...) the strip allows the auteur to express himself completely."
I knew that Manara and Hugo Pratt (Corto Maltese) were friends, I did not know Manara had studied under Pratt. Pratt himself never used a ruler (as Manara explains in French/Italian in the video), and at times, when he was ill (such as in Corto Maltese's last adventure), his drawings seemed a bit crude, as if the publisher had only printed unfinished sketches. But there was this strong feeling of a controlled gesture within Pratt's line, such when he would draw waves and a boat with just an inkbrush, in a very impressionistic way, but only with black ink and white fields.
(Pratt was my first sequential art hero, long before Eisner)