Great quote from an article in Frieze by Edward Allington. First published in Issue 92, June-August 2005; the article contains notes which are not online. Must find that McEvilley quote…
Most pieces of Conceptual art are, to quote Thomas McEvilley, objects: ‘Theories, of course, are things; they are what Edmund Husserl called Noemantic objects, that is, mental objects. Every thought or concept is an object, and every object has form or aesthetic presence (what does a centaur look like? an angel?). There is, in other words, an aesthetics of thought with its own styles and its own formalism.’