On Imagism About Phenomenal Thought

Imagism about Phenomenal Thought is (roughly) the view that there is some concept Q (for some sensory quality Q) that we can employ only while we experience the quality Q. I believe this view is theoretically significant, is or can be made intuitively appealing, and is explicitly or implicitly accepted by many contemporary philosophers. However, there is no good reason to accept it. Or so I argue.