Hi from Thunder Bay National Marine Sanctuary in Alpena, Michigan. Alpena is an old town with a long history – a history that’s impossible to miss walking the Great Lakes Maritime Heritage Trail. Enjoy the slideshow — and see what public art should be! The massive scrims (lightweight translucent fabric) hang from the exterior walls of the former Fletcher Paper Mill. The largest two depict shipwrecks as they now appear underwater. When I saw them yesterday, the scrims reminded me of looking at a wreck underwater.