How do cannibals kiss? It must get messy, with a certain amount of lip-chewing involved. There’s a mass of bloody crimson – a maelstrom of near-abstract swirls, from which two faces emerge as you gaze – in a painting by American artist Elizabeth Peyton, which appeared this autumn in a huge reproduction on the facade of the 13th-century palazzo Ca’ de Mosta in Venice. It’s the first poster image for Bones and All, the latest film by Italian director Luca Guadagnino, which tells a story of two young cannibals in love. Guadagnino recalls: “I said to Elizabeth, ‘Find the image...