Google is no stranger to phone-based augmented reality. But while it was there on the scene years before Apple put out its ARKit, Google didn’t make the best use of its lead. It’s trying to catch up with ARCore, but the limited number of supported devices, not to mention apps, isn’t exactly making it an easy sell. Then comes Just a Line, still labeled as an AR Experiment. Simple in idea and execution, it has the potential to become an addictive example of AR on your phone. Provided it becomes even more widely available.