Australia has over 100,000 Aboriginal rock art sites, and traditional designs, patterns and stories infuse contemporary Indigenous Australian art, "the last great art movement of the 20th century" according to critic Robert Hughes; its exponents include Emily Kame Kngwarreye. Early colonial artists showed a fascination with the unfamiliar land. The impressionistic works of Arthur Streeton, Tom Roberts and other members of the 19th-century Heidelberg School—the first "distinctively Australian" movement in Western art—gave expression to nationalist sentiments in the lead-up to Federation. While the school remained influential into the 1900s, modernists such as Margaret Preston, and, later, Sidney Nolan and Arthur Boyd, explored new artistic trends. The landscape remained a central subject matter for Fred Williams, Brett Whiteley and other post-war artists whose works, eclectic in style yet uniquely Australian, moved between the figurative and the abstract. The national and state galleries maintain collections of local and international art. Australia has one of the world's highest attendances of art galleries and museums per head of population.