I'm not convinced that it's appropriate to assume that it would have been world shattering.. We have people now who lived their entire lives not realizing that

I'm not convinced that it's appropriate to assume that it would have been world shattering.. We have people now who lived their entire lives not realizing that other people visually "see" with their mind's eye. I think the more likely assumption is that those with an inner monologue would have just thought it normal, and that everyone else was the same.