The post title is in reference to the photo above. The answer? This:
“Look at the wall,” David Mellor, the Boston Red Sox groundskeeper, said to sports photographer CJ Gunther. “Ok,” shrugged back Gunther. “No. Really look at it.” It was then that Gunther realized he was staring at hundreds of baseball marks scattered along Fenway’s famous Green Monster wall. “You need to come shoot pictures of these,” said Mellor.” And with Mellor’s declaration in 2009, CJ Gunther began his body of work, chronicling the detailed scars scattered across baseball’s arguably most famous wall. “My first reaction was awe. I’ve been coming here forever and never seen this,” recalls Gunther.Go here to see the photos and read how they're made.