The Kuleshov effect is a film editing (montage) effect demonstrated by Russian film-maker Lev Kuleshov in the 1910s and 1920s. It is a mental phenomenon by which viewers derive more meaning from the interaction of two sequential shots than from a single shot in isolation. Specifics Kuleshov edited a short film in which a shot of the expressionless face of Tsarist matinee idol Ivan Mosjoukine was alternated with various other shots (a bowl of soup, a girl in a coffin, a woman on a divan). The film was shown to an audience who believed that the expression on Mosjoukine's face was different each time he appeared, depending on whether he was "looking at" the bowl of soup, the girl in the coffin, or the woman on the divan, showing an expression of hunger, grief, or desire, respectively. The footage of Mosjoukine was actually the same shot each time. Vsevolod Pudovkin (who later claimed to have been the co-creator of the experiment) described in 1929 how the audience "raved about the acting... the heavy pensiveness of his mood over the forgotten soup, were touched and moved by the deep sorrow with which he looked on the dead child, and noted the lust with which he observed the woman. But we knew that in all three cases the face was exactly the same." Kuleshov used the experiment to indicate the usefulness and effectiveness of film editing. The implication is that viewers brought their own emotional reactions to this sequence of images, and then moreover attributed those reactions to the actor, investing his impassive face with their own feelings. Kuleshov believed this, along with montage, had to be the basis of cinema as an independent art form. The effect has also been studied by psychologists and is well-known among modern film-makers. Alfred Hitchcock refers to the effect in his conversations with François Truffaut, using actor James Stewart as the example. In the famous "Definition of Happiness" interview which was part of the CBC Telescope program, Hitchcock also explained in detail many types of editing to Fletcher Markle. The final form, which he calls "pure editing", is explained visually using the Kuleshov effect. In the first version of the example, Hitchcock is squinting, and the audience sees footage of a woman with a baby. The screen then returns to Hitchcock's face, now smiling. In effect, he is a kind old man. In the second