Sorry for the above. It was an instant reaction and came with an Aha! and a delighted grin.
I am fascinated by the ice-cream colours in the band along the top, which I take to be the fringe of an awning, the main part of which is projecting from the cafe above the window (out of our sight line) and casting the pavement shadow that stretches from the cafe below the window (out of our sight line) and makes the darker-ness within.
That stripe holds all the sunshine.