Having seen the image after reading a title, and then opening a web page, at first my mind was, "Huh...that's one hell of a big shadow for such a skinny tree!" and the of course, I saw the real shadow. This picture is a sort of visual perception trick, a visual amusement and delight for our sense of perception. It has a fun sort of , "Look, a pretend shadow! Wheee!" sort of levity. Oddly, my eye barely goes to that tree leading to the upper right corner...I've looked at the photo multiple times now, and despite a comment about it above, to me the upper right corner utterly disappears: I focus in on the left side third, over and over and over, and then go right over to the far right side, to that amazing waterfall.
This is the kind of photo that would be great to look at in a moderately large print. some images are great as screen images, some are not. This one's pretty interesting even at this small size on-screen on an iMac, but larger, I think the grain would come more to the forefront, and that would bring the sort of elevated authenticity of film up and into the enjoyment of the picture.
I like it. Why? This is a shadowplay picture, which is its very own "thing" in photography, and has been for a long time. It's about the way shadows cast themselves onto the world. The light itself is interesting, sort of dappled into large-ish areas, each about 25% of the frame area, where the light itself has been modulated. The large, central line looks like a shadow from a tall coniferous tree nearby--but we can wonder, is it really?