There is no colour in existence that so powerfully communicates urban alienation, the atomisation of human beings inside the edifices they create, as this noxious pallid green, which only came into being with the advent of electricity, and which is inextricably associated with the nocturnal city, the city of glass towers, of empty illuminated offices and neon signs.

The diner was a place of refuge, absolutely, but there was no visible entrance, no way to get in or out. There was a cartoonish, ochre-coloured door at the back of the painting, leading perhaps into a grimy kitchen. But from the street, the room was sealed: an urban aquarium, a glass cell.

Hopper himself had a conflicted relationship with the common interpretation that loneliness was a central theme of his work. Although he often denied that it was a deliberate creative choice, he once conceded in an interview: “I probably am a lonely one.” Laing, whose attention and sensitivity to even the subtlest texture of experience are what make the book so wonderful, considers how Hopper’s choice of language captures the essence of loneliness:

It’s an unusual formulation, a lonely one; not at all the same thing as admitting one is lonely. Instead, it suggests with that a, that unassuming indefinite article, a fact that loneliness by its nature resists. Though it feels entirely isolating, a private burden no one else could possibly experience or share, it is in reality a communal state, inhabited by many people. In fact, current studies suggest that more than a quarter of American adults suffers from loneliness, independent of race, education and ethnicity, while 45 per cent of British adults report feeling lonely either often or sometimes. Marriage and high income serve as mild deterrents, but the truth is that few of us are absolutely immune to feeling a greater longing for connection than we find ourselves able to satisfy. The lonely ones, a hundred million strong. Hardly any wonder Hopper’s paintings remain so popular, and so endlessly reproduced.

Reading his halting confession, one begins to see why his work is not just compelling but also consoling, especially when viewed en masse. It’s true that he painted, not once but many times, the loneliness of a large city, where the possibilities of connection are repeatedly defeated by the dehumanising apparatus of urban life. But didn’t he also paint loneliness as a large city, revealing it as a shared, democratic place, inhabited, whether willingly or not, by many souls?