> If you tell me to imaging an equilateral triangle, I can put it there in my mind's eye, and if you tell me to attach another equilateral triangle to it I can see the resulting parallelogram.

For me, I can't. With the Apple example, I don't see (or imagine) anything. I know I am thinking of an Apple, and my thinking is also entirely verbal/monologue based so it's like a thought of "I am thinking of an Apple" there's no accompanying visualization, etc. When I'm really deep in thought I have subvocalizations too, slight movements of my mouth and tongue as if speaking the words of my internal monologue. To me the absence of language seems impossible to my mind.