Quran imitations represent literary attempts to replicate the style, form and content of the Quran. Historically, they emerge in a dialectic with the doctrine of the i'jaz (inimitability) of the Quran, which asserts that the literary and/or semantic nature of the Quran cannot be reproduced (tahaddi) by a human. Both Muslims and non-Muslims have written Quran imitations for various reasons, including as literary exercises, means to express one's admiration for the Quran, or attempts to meet the Quran challenge.