These patterns of color and shading appear to be leaves, but actually are simply an impression on a sidewalk, a remnant from a leaf no longer there.
People leave impressions on the world after they are no longer there. When these impressions are so vivid that it feels like we are seeing the person, some say that it feels like they have seen a ghost.
But usually the impressions of those no longer with us are more vague and fleeting, like the places in the grass where leaves have been after they are raked or blown away. But even if it's not a conscious impression or clear image, we remember.
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