A solargraph has no lens, only a hole in a can. A smaller hole draws sharper and darker, until it is so small that light bends through it and spreads out again. Every can has one best hole.
The street is busy all day and none of it reaches the paper. The sun does, because it comes back. So does the man at the boot-black's, who stands in the same place every morning.
drag across the paper or use the slider to change the hole · new sheet starts again · faster runs the days
day 0 on the paper