A Pane-ful View
Make no mistake about it, this is an actual window that you’re looking through. It looks like a snapshot taken after bullets have been fired at the glass. The only problem with this assumption is that it’s quite far from what this glass really is. These are bumps that you see, and it has a very clear explanation.
This window is from an old building, and as such, the panes were created using the old spinning method. The method involved spinning molten glass into a flat shape, which leaves them with whorl. This whorl which marks the point where the spinning took place is the bumps that you see in this picture.