If I write fiction I start to create the scenes and people in my mind as if I'm staging a play or building a level in a 3d engine. The words I write down are then a description of what I'm seeing, as if I'm writing a review of the play I just staged.
A further interesting line of thought: Can you re-hear sounds from memory? Can you re-feel touch? Re-smell? Re-taste? Can you re-experience emotions? With a bit of focus I can do all of those things, though it helps if the original memory is strong. My "inner ear" is especially strong, maybe even stronger than my "inner eye."