Paul Cézanne, who died in 1906, has been iconic ever since Picasso and Braque picked up and turned his fraught, hard-won way of looking at apples, mountains and people into the broken mirror of cubism, yet his revolutionary importance is less well understood in the 21st century.

His portraits turn out to be the key that unlocks his genius for today. Even if his landscapes don’t punch their modernity into your mind, it really is impossible to ignore the strangeness and newness of the way he saw people.