A plant grows through it

Under the 4th Street bridge in downtown Los Angeles, the side of the hill is covered with these rocks. At least six months ago a plant somehow grew through the concrete, but there's only a small window of time in the day when sunlight peeks through from above down on it. And for months that time was never when I was passing by.
That is, until mid-October. These shots were taken between 9:50 am - 10:00 am on October 10, 16, and 17. Within a week after that, the window of sunlight on it had expired until next year.