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The Print Cabinet of the Warsaw University Library has several charts with designs of the painted decoration of the elongated interior of the Orangery. In 1961, Marek Kwiatkowski decided that the designs had been made in 1786 by the architect Jan Christian Kamzetzer and that they were meant for the Orangery rooms, today referred to as the Old Orangery found in the Łazienki Park. The Author of the article provided information that the paintings in the Łazienki Orangery Hall may have been executed in 1788 by Wawrzyniec-Laurenty Jasieński, a student of Szymon Czechowicz. In 2012, traces of the old polychrome were discovered on the western wall from the side least of the escarpment, affected by sunshine. They were conserved the following year to bear testimony to Kamsetzer’s and Jasieński’s work.