Eye Watching

From "The Art of Photography: An Approach to Personal Expression" by Bruce Barnbaum

With the eye able to see only small bits sharply at any moment, it must move about speedily to view the entire scene. It does not do so in an organized fashion like a TV scanner. Instead, it darts about randomly, up and down, side to side, picking out bits and pieces here and there, and sending these tidbits back to the brain at a furious pace. The brain processes this random data and puts it all together, like a mosaic or a jigsaw puzzle. While studying the scene the eye stops momentarily at prominent objects and sees them with real clarity, filling in the rest in a rather fuzzy manner. Thus, the eye does not perceive the whole scene with uniform sharpness or interest.