I am curious why some images are harder to hold in the imagination? I think it's because of ego, but I'm not positive. For example holding Sassoferrato's "Madonna and Child" in my imagination is particularly difficult, but also it sort of creates what I know only to describe as a sort of psychological discomfort.
It's like the image gets devoured in my imagination faster than others, and it takes many more glances to hold with the same consistency. This intrigues me. But also frightens me. It is very easy for me to visualize things that are negative, whether it be sexual, anger, or greed related, but this image is like krptonite for my imagination and just won't hold under any circumstances.
Even some positive images on this site hold much more easily, for instance the Tree of Life.
This applies to any Madonna and Child image for me, the aforementioned was only a concrete example. It's like it's blurred or stick figures in comparison to the real image, very quickly compared to when I try to image other things. Is there a reason for this? Should I avoid the image for easier things to imagine for me?