We are, all of us, having a moment. Watching the beautiful cathedral of Notre-Dame de Paris apparently consumed by fire brings everyone up short: French or not, Christian or not, Catholic or not. As we watched the conflagration, slack-jawed on our smartphones, we were suddenly faced with any number of uncomfortable thoughts: Nothing lasts. Life is transitory. Permanence is an illusion. Is this the end? Architecture has this power: What inspires us can also undo us. The power that Notre-Dame…