I have a theory therefore that when we visualise, we use not “picture-making” facilities, but “picture-recognising facilities” which we have in plenty. We have many structures that resonate with incoming visual stimuli to recognise them and we simply use these recognition’s to attempt to build up our visuo-spatial imagery. The result is a vague “sense” of a picture. Certainly in my case it is vague. I do not know what you see when you think of a visualisation, perhaps you see an eidetic image in full colour. Then again, what we all see may be just the emperor’s new clothes!