What is this? It seems like a compilation of every image I have ever taken and random images too. Like these: Does OS X somehow compile all of the images in all of the different places on my computer into one location? And is so, are they copies? Or just 'links'? I guess what I want to know is, what will happen if i erase them? I am trying to free up space on my HD and I can't seem to figure out where all of it is being used up. This folder itself is 20GB.