The borrowed hat and the Ibbur book
An unnamed narrator in Prague picks up the wrong hat at a cathedral, then dreams through the life of its owner, the ghetto gem-cutter Athanasius Pernath. In that life a stranger brings Pernath an old book, 'Ibbur', asking him to repair a damaged initial letter. The stranger's face matches the legendary golem, and Pernath soon realises he cannot tell whether the visitor was someone else or himself. When the narrator later tries to return the hat, he finds Pernath alive behind a wall he cannot enter, and the identity puzzle is never closed.
