"When Heidi Met Shimen" is a book by Moshe Koppel that expands upon his blog, "Judaism Without Apologies," where he juxtaposes the lives and ideals of two Jewish characters: Shimen, a Gerer Hasid and Holocaust survivor, and Heidi, a cosmopolitan Princeton graduate.

Ludwig Wittgenstein's "Philosophical Investigations," published in 1953, challenges traditional views of language and truth by asserting that words do not simply name objects, but derive meaning from their usage within a language.