We “compare” the two trees (or “compare and contrast” them), at first, anyway, without thought or analysis. We just see them. The two trees stand there in our minds, juxtaposed, meaning by inference. We experience, rather than articulate, the result. The juxtaposition results in a feeling: instantaneous, spontaneous, complex, multitonal, irreducible. And we’re really good at this. Say the painting has in it that healthy tree and a second one that, on first glance, looks identical. The mind immediately starts scanning for differences. Say there’s a bird in one of the trees, barely noticeable.
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