Tim is right, but it takes close inspection to find that lonely weed. If you crop this image so as to equalize the amount of space on either side of the Tufa, the weed will shift to the lower right corner, and the flow of light will take the eye right to it.
I like the way the lonely weed is lit, the long shadows which remind me of the generations needed to build these structures, and the scale that the weed provides to let us see home large these tufas are.
