Check out /r/hyperphantasia. I’m between a 2/3 on the scale and can visualize anything with a slight grayish hue. It’s not just visuals either, I can remember smells and reexperience it. The best way to describe it is like a kind of out of body experience where your mind goes somewhere else. It’s a separate plane of existence, like an astral projection. It’s a nice evolutionary quirk that was probably necessary in survivalist times. The whole future thinking aspect of it probably stopped early humans from demise. Otherwise if you really wanted to know what hyperphantasia is like, I think there are drugs that would give a similar experience.