Rings appear to rotate when observers approach or move away from the image during fixating at the center.pic.twitter.com/wKYoJAk96J
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.