Rows of spark plugs with names. Fun symbolism with the idea of a "spark" of knowledge as well. Similar to specimens wall. Spark Plug could be out parallel to wall instead of perpendicular. Variety of Spark Plugs mixed in as well.
need to try for well water.DIY Home Distillation of Alcohol (Homemade Alcohol to Drink) - it is important to know that distilling alcohol is ILLEGAL; however, stills can also distill WATER - important in SHTF times.