You all knew I had to include a 19th Century European photographer for Genius Week, and I chose Gaudenzio Marconi (1841-1885) a Swiss photographer who relocated first to Paris and then to Brussels. Marconi wasn't the first to produce male nude photo studies for artists, but he was the first to do so in sufficient quantity and quality to produce an impact. In fact, part of the reason he decamped to Brussels was due to the Paris authorities taking a reactionary bent and prosecuting him for offending public morals. As an added element of interest, all ten of today's photos will be of the same amazing (and adaptable) model. We start with him wielding a knife.