At the Académie Julian, his fellow students included Paul Sérusier and Pierre Bonnard, who had shared ideas about painting. Through Bonnard he met additional artists, including Édouard Vuillard, Paul Ranson, Ker-Xavier Roussel and Hermann-Paul. In 1890 they formed a group which they called the Nabis, taken from "Nabi"—Hebrew for "Prophet". Their philosophy was based upon the philosophy of positivism, and the writings of Auguste Compte and Hippolyte Taine. I rejected naturalism and materialism in favor of something more idealistic. Denis described it in 1909: "Art is no longer a visual sensation that we gather, like a photograph, as it were, of nature. No, it is a creation of our spirit, for which nature is only the occasion."