The Nories were also important figures in professionalisation of Scottish art and the development of art education. Probably a student of the Nories was Charles Steuart (fl. 1762–90), who produced a series of Perthshire landscapes for the Duke of Atholl at Blair Castle, including "The Black Lynn, Fall on the Brann" (1766). Also among the students of the Nories was Jacob More, who moved to Italy from 1773 and is chiefly known as a landscape painter who created Claudian-style, classically inspired landscapes. More's series of four paintings "Falls of Clyde" (1771–73), produced before his departure to Italy, have been described by art historian Duncan Macmillan as treating the waterfalls as "a kind of natural national monument" and has been seen as an early work in developing a romantic sensibility to the Scottish landscape. This period saw a shift in attitudes to the Highlands and mountain landscapes in general, from viewing them as hostile, empty regions occupied by a backwards and marginal people, to interpreting them as aesthetically pleasing exemplars of nature, occupied by rugged primitives, which were now depicted in a dramatic fashion. Highly influential in this process was the Scottish philosopher Archibald Alison's "Nature and Principles of Taste" (1790), which widened the forms of landscape seen as appropriate for painting, placing an emphasis on their historical significance and emotional impact on the painter. Paul Sandby (1731–1809), often considered the "father of British watercolour painting", visited Scotland as part of the military survey that followed the 1745 Jacobite rebellion and undertook a number of studies of Scottish scenes. His abandonment of traditional pen and ink drawing, using washes of colour in order to paint directly in watercolours without pen outlines, opened the way for the creation of powerful Romantic landscapes. Alexander Runciman (1736–1785) was probably the first artist to paint Scottish landscapes in watercolours in the more romantic style that was emerging towards the end of the eighteenth century. Alexander Nasmyth (1758–1840) trained in the Trustees Academy in Edinburgh under Runciman. He visited Italy, where he met with More, and worked in London, but returned to his native Edinburgh for most of his career. He produced work in a large range of forms, including his portrait of Romantic poet Robert Burns, which depicts him against a dramatic Scottish background, but he is chiefly remembered for his landscapes and is described in the "Oxford Dictionary of Art" as "the founder of the Scottish landscape tradition".