Not everyone has imagination? Bullshit. You could argue, perhaps, that not everyone has strong imagination, but everyone certainly has imagination. Unfortunately, imagination is something that is severely underrated and overlooked in today's academic world.
I can't find a link now, but something I read on HN a while back said that it has been demonstrated that the capability to mentally picture something is variable across the population, with some people lacking the ability entirely. IIRC, in the late 1800s, there was some debate as to whether the "mind's eye" actually existed as an experience separate from the mental recitation of the words describing such an experience, and it was eventually found that the opponents of the mind's eye idea did not have the ability themselves.
I'd appreciate it if someone who knows the right keywords to search for could find the original reference, and correct me if necessary.