Alex Colville. Family and Rain Storm, 1955.
Of the Canadian's many dozens of arresting paintings, I could not choose a favorite but this one is probably the most famous, and it includes many of his signature motifs: the act of going somewhere, an oblique anonymity, the fragment of a larger story left untold, and technology as framing geometry.
One surprising facet of his art for me is the date. He was painting us in the West as we were going to be through the height of Empire.