It's funny that just five years ago, the book "Unknown Pleasures" (by Peter Hook) used the same image on its cover with the claim that attempts to trace the cop

It's funny that just five years ago, the book "Unknown Pleasures" (by Peter Hook) used the same image on its cover with the claim that attempts to trace the copyright holder had been unsuccessful. When I saw it in a bookshop it seemed like a kind of dismissal of the scientific origins of the image: it was well known where Peter Saville had got it from, though beyond that perhaps the copyright was a mystery. As far as appearance goes, a similar-looking technique for shading relief maps was invented by Kitiro Tanaka in the 1930s: http://www.mountaincartography.org/mt_hood/pdfs/kennelly2.pdf http://www.mountaincartography.org/mt_hood/pdfs/kennelly2.pd... Original paper by Tanaka https://www.jstor.org/stable/1785198 https://www.jstor.org/stable/1785198