The V&A Museum of Childhood currently have an exhibition of A Century of Olympic Posters (until Sept 7). For me, the posters that work best are those that use Olympic symbols, and mix them with sporting icons, and add visual elements of the host nation or city. There was a definite trend - earlier posters were quite illustrative, realistic and detailed, with the lines becoming clearer and more minimal as time went on. My three favourites were: Mexico 1968 Olympic poster: Starting with Me