Paganini's popular reputation rested always on his phenomenal technique as a violinist, coupled with a showman's ability to dominate an audience and to stupefy those who heard him by astonishing feats of virtuosity. His playing served as an inspiration to other performers in the nineteenth century, suggesting to Chopin, in Warsaw, the piano Etudes, and to Liszt the material of the Paganini studies that he wrote in 1838. The very appearance of Paganini impressed people. His gaunt aquiline features, his suggestion of hunched shoulders and his sombre clothing, gave rise to legends of association with the Devil, the alleged source of his power, an association supported by the frequent appearance by his side on his travels of his secretary, one Harris, thought by some to be a familiar spirit or a Mephistopheles watching over his Faust. Stories of a pact with the Devil were denied by Paganini himself, who, with characteristic understanding of the value of public relations in a more credulous age, told of an angelic visitation to his mother, in a dream, foretelling his birth and his genius.