“When I close my eyes, there’s absolutely nothing there,” Shine recalls telling his colleagues. They immediately asked him what he was talking about. “Whoa. What’s going on?” Shine thought. Neither he nor his colleagues had realized how much variation there is in the experiences people have when they close their eyes.

I found this bit about closing your eyes curious. It doesn't matter for my mental imagery if my eyes are closed or not. My eyelids are not a movie screen. I can imagine things quite as well with my eyes open. I focus less on what my eyes are seeing when I think hard about mental images, but they aren't really in competition. It's very easy to imagine visual things right there in my actual eye imagery.