After writing the previous post, I remembered something I saw more than a decade ago. During a partial solar eclipse, I saw the image of the crescent Sun projected onto the ground through tree leaves. The leaves act as pinhole cameras by blocking out all but a small portion of the light.
This doesn’t happen only during an eclipse, of course. Next time you walk under a tree on a bright summer day, look for small, roundish images on the ground below the tree. These are images of the Sun, created by the leaves over your head! Even without a lens, the tree has created a picture of the Sun. The world is an amazing place.