For the Masonic Fraternity, the concepts of light and geometry are central to the Masonic Rituals. As Jean-Luc Leguay is a Brother Freemason, this lecture, held on June 23rd, 2016 and now available to stream below, touches on topics that will be of great interest to Freemasons, to those who are interested in Freemasonry, to those interested in the rare knowledge of illumination, to those who have a love of art, and to those touched by the tragedy of 9/11.