German paleontologist Otto Jaekel argued in 1905 that there was no direct scientific evidence that the tall dorsal spines on "Dimetrodon" and ""Naosaurus"" were bound in a web of skin like a sail or fin (as portrayed by Cope, Knight, and others) and proposed instead that the long bony projections served as an array of separated spines to protect the animals, which allegedly could roll up like hedgehogs. Spiny-backed reconstructions of ""Naosaurus"" (with a large carnivore's head) appeared in different German sources, including as a tile mosaic on the façade of the Aquarium Berlin in 1913 (destroyed in World War II and later recreated).