Found Marks

 Over the next few days I would like you to be on the lookout for marks in the world that are not made by humans. If you have access to a camera please photograph at least 10 of these "found marks" and upload them to this post in your blog. If you don't have access to a camera, you may describe the marks you found in detail instead. If you choose to write, describe what made the mark, exactly where you saw it, and when you saw it (date and time of day). Images from the internet are not acceptable!