Inscribed in the Book of Life

Vienna has the most effective Holocaust memorial I've ever seen. At first, it looks like a large and blocky tomb; when you get closer, you see that the ridging on the sides is actually row after row of carved books, spines to the inside, numbering in the thousands. The "tomb" is a library, turned inside-out. The People of the Book are represented by books whose titles are forever hidden from view. The doors are permanently sealed, without doorknobs; the inside of this library is a vast empty space, inaccessible, lost.