Tracking down some of these people would be useful because there are clearly techniques and 'ways of doing' that have commonality, though could have arisen in more than one place and also spontaneously. That a lot of people did this is not disputed and a lot of them were glassworkers that were stopped from working in a glass-works due to health problems. Health problems caused, in part at least, by the toxicity of the materials they worked with. Others are following a family tradition, Lauscha and holiday resorts.