There are works in which a single detail steals the show. Leonardo's Mona Lisa is famous for that smile. Michelangelo's The Creation of Adam is famous for those hands. And Vermeer's View of Delft – well, not quite so famous. But among readers of Proust, at least, the painting can't be recalled without a mention of one particular bit.
(Also, for and expanded view of the "Le petit pan de mur jaune...", clik here: http://www.essentialvermeer.com/proust/proust.html)