The then-current theory of color held that white light was elementary and that colors arose from mixtures of light and dark. Newton criticised this theory by noting that in that case a printed page, with its juxtaposition of light and dark, would look colored. In folio 122 he recorded for the first time his notion that white light is heterogeneous and color arise, not through the modification of a homogeneous white light, but from the separation of this mixture into its components. Newton also mentions Hooke 's theory of color, including his idea that it is a wave. Newton dismisses this theory with the remark that then light should bend around edges of objects as sounds do.