Photographs are often called 'stains of light'. In 1827, the first photo by Nicéphore Niépce, which was made by exposing bitmen for about eight hours on the window of his room, was a trace of light.
The dancers were performing on the beach. The prints of them performing against the empty sky glowed in black marks. When I see such a "stain," I feel something special that the they were close to me rather than they were similar to reality. Some kind of tactile touch...
"The light that touches me standing here seems like the starlight that is delayed."