Appropriation art or the art of appropriation is is the use of pre-existing objects or images with little or no transformation applied to them. It follows in the spirit of Marcel Duchamp’s Readymades. The use of appropriation has played a significant role in art throughout the 20th century and has continued as a valid art form to the present. In the visual arts, to appropriate means to properly adopt, borrow, recycle or sample aspects (or the entire form) of human-made visual culture. Inherent in our understanding of appropriation is the concept that the new work recontextualises whatever it borrows to create the new work. In the past decade there has been a considerable rise in court cases citing plagiarism. Here is the Artlyst top ten most controversial works of Appropriation Art, and some of the court cases that followed.