The photo above - in fact, all of my photos - fail to do it justice. The whole chapel is stained glass, three walls of it plus a huge round window above the entrance door. Each window is a slightly different design shape, and each one tells a different part of the story. There are no pews inside, just chairs around the perimeter for you to sit and stare, mouth open.
I have managed to visit quite a few bookshops in Paris, and this is the most famous - Shakespeare and Company was operating before WWII and the original shop, so the story goes, was closed down by a German commander when the owner refused to sell him a book. This shop is opposite Notre Dame, near St Michel metro, and has a library of old books upstairs which is just for sitting and reading, not for sale.
I also visited Abbey's Bookshop (the smallest in the world?), and several other larger shops. And found The Red Wheelbarrow bookshop as well. It seems like the smaller the shop premises, the more books they cram in, so there are towering piles everywhere that threaten to topple over as you pass. In one shop, a woman did in fact knock over a huge pile, then apologised profusely, but the assistant just said, "Oh don't worry, I do that myself at least twice a day." I guess if you work there you would either have to have a very good memory of where books are, or be excellent at finding things!