The Answer:
The Question:
Do you think a spell is possible without Visualization?
Vocalization, subvocalizaton, and yes, thought its self is purely a process of mental visualization.
So while I think, I understand the question's point.
All living things that have self awareness, can only do autonomic actions without Visualization.
Yet arguments for Sigels, Signs, Incence, Oils and other roots of magick perhaps can work with out pre-mential visualizations . Sorry for such a long Witchtechie answer but, you ask.
Perhaps the Great Arts should be thought of as "Superia Visualization Process".
TDK