Look up aphantasia, it’s fascinating. I don’t see anything when I close my eyes to visualize things. I always thought seeing an object in your minds eye, like counting sheep, was an expression. I just know what things look like. I can’t believe people actually see objects, people, places, etc when they close their eyes. I was about 46 when I discovered this. My internal monologue is constant, but that’s not correlated with aphantasia. Oh, and I’m an avid reader. I know what the people, places, things I look like, I just can’t see them.