just now I browsed through the latest gallery update on photoblogography, and when I continued on to the older pictures, I found this one.
That picture really got to me. The nice smooth curve gives an almost sensual feeling. Adding the perspective, I also get a feeling of acceleration towards the vanishing point at the top of the frame. The lines in the stone that are actually converging (regardless of the viewpoint), strengthen the motion inwards into the picture. The small stones in the left calms the image down a bit. The closest one gives the eye a resting point, while the furthest strengthen the perspective.
Even if it is a color image, it is almost entirely monochrome by nature, which I am a great fan of. The only certain clue is in the line with the rust colored spots.