I think the hornets nest is to say that if you see a picture of something in your mind, it is the same as the occult practice of trying to create reality with pictures. That thought is not even related to my post, it is a thought that has no business on a Christian site and I think that poster should send an apology to everyone.I don't see that as teaching or practicing visualization.
I'll concede, the OP may not have had the New Age practice in mind but it was still a poor choice of words as it stirs up a hornet nest.