lid should be kept closed when the piano is not in use. once the tar engine has learned what it can about the control set, that’s it. that history can be seen around our city and is still celebrated today. i haven't had a stable amount of structure at a constant in my life. i was trying to see how much a difference in temperature was needed to cause glass to break – using hot water, cold water and drinking glasses from the kitchen. i believe this is your best choice. 