What has the author D Harding written?

D. Harding is a philosopher, not an author. He is known for his work in philosophy of mind, particularly his critique of materialism and his development of a theory of consciousness based on the concept of "the unobserved observer."

He has written numerous academic articles and books, some of which include:

* The Unobserved Observer (1958)

* Experience and the Nature of Reality (1979)

* The Logic of Perspective (1990)

* Metaphysics and the Mind-Body Problem (1993)

* The Way of the Mind (2000)

His work has been influential in philosophical circles and has been explored by a variety of other thinkers.

It's important to note that D. Harding is not a widely known public figure like a novelist or a popular nonfiction writer. His work is primarily focused on philosophical inquiry and is targeted toward an academic audience.