The painting, The Procuress (1656), has long been suspected to be atypical of Johannes Vermeer’s painterly style and characteristics: the airiness the painter often favoured gives way to a more limited space and its light treatment, except a more prominent one on the carpet, is confusedly rudimentary, as if the whole canvas was emerging from a film of smoke and sands. Depicted here a brothel scene, but any feelings of seediness or raucousness are diluted, presumably for the sake of decency, which is an undercurrent flows beneath Vermeer’s oeuvre, attests to the Dutch master’s contemporary role as an unsung genius. What is peculiar about this painting is the man on the left, long rumoured to be the self-portrait of the painter, who is seen staring casually into the viewers. The glance is a conspiratorial one, seemingly in complicity with the beholders. This imposed intimacy generates an unnerving effect; unconsciously the viewers do find themselves return the uncanny...