The "plastic style" of early Celtic art was one of the elements feeding into Art Nouveau decorative style, very consciously so in the work of designers like the Manxman Archibald Knox, who did much work for Liberty & Co., especially for the Tudric and Cymric ranges of metalwork, respectively in pewter and silver or gold. Many of the most extravagant examples of the plastic style come from the modern Czech Lands and influenced the Czech Art Nouveau designer and artist Alphonse Mucha (Mucha, in turn, influenced the Irish-American O'Shaughnessy, who had attended a series of Mucha's lectures in Chicago).