This is a series of 6 (six) etchings burned out of steel plates with Nitric Acid-the only acid I use nowadays. Each print is based on an element of life studied by Leonardo da Vinci, as mentioned in my book, I, LEONARDO. The six images will be titled EYES ARE THE WINDOWS OF THE SOUL, FORTIFICATIONS, RENAISSANCE HEALTH CLUBS, HOT GASEOUS VAPORS of the HUMAN BODY, THE THEORY of RANDOM ORBITS & KEEPING FIT.