am calling this one "shingle grid shadow". it's part of the processing with the "shingle grid" series posted in late July/13;
http://gregpatch.blogspot.com/2013/07/blog-post_26.html
http://gregpatch.blogspot.com/2013/07/blog-post_27.html
http://gregpatch.blogspot.com/2013/07/blog-post_28.html
while the shingle/moss/lichen piece sat on the mossy and lichened picnic table it gathered more of its defining characteristics it left its imprint on the table.
here Sun light and shadow created this "negative" image. this shot was taken after a rain, as one of the many rains this summer had just ended. will take a comparative shot as things dry out and will post...