People in the Sun by Edward Hopper.
Hopper is famous for the loneliness in his paintings and even though this is a group of people, the chairs are staggered so each person is alone as they enjoy the sun.
Stark
Nighthawks, 1942 by Edward Hopper, The Art Institute of Chicago.
One of the most popular paintings in the AIC's collection people are intrigued by the familiar scene and the loneliness Hopper captures.