If whole-priority is not unique to spatial representation but also appears in certain conceptual systems, then whole-priority alone cannot mark a categorical distinction between spatial and conceptual part-whole relations.

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categorical distinction(contrasted with modal or perspectival distinctions): A fundamental, real difference in what something IS or what category it belongs to—not just how it appears or from what angle you look at it.
conceptual systems(as used in philosophy of mind and epistemology): Organized sets of ideas and concepts in our minds that we use to understand and categorize the world, like mathematical systems or language rules.
part-whole relations(as used in metaphysics and ontology): The logical relationships between individual pieces (parts) and the larger things they make up (wholes), like how bricks relate to a wall.
spatial representation(what we're trying to determine is real or illusory): The way our minds picture and understand space, distance, and how objects are positioned around us.

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