Book excerpt: In Potential Images Dario Gamboni explores ambiguity in modern art, considering images that rely to a great degree on a projected or imaginative response from viewers to achieve their effect. Ambiguity became increasingly important in late 19th- and early 20th-century aesthetics, as is evidenced in works by such artists as Redon, Cezanne, Gauguin, Ensor and the Nabis. Similarly, the Cubists subverted traditional representational conventions, requiring their viewers to decipher images to extract their full meanings. The same device was taken up in the various experiments leading to abstraction. For example, it was Kandinsky's intention that his work could be interpreted in both figurative and non-figurative ways, and Duchamp's Readymades suggested the radical conclusion that 'it is the beholder who makes the picture'. These invitations to viewers to participate in the process of artistic communication had social and political implications, as they accorded artist and beholder symmetrical, almost interchangeable, roles.