Flat vector illustration, Zack D. Films explainer style: thick black outlines, muted palette of beige, dusty blue and warm skin tones, plain light beige background, one subject centered, no gradients, no photorealism, no 3D. Cross-section diagram of the skin on a fingertip: the blood vessels underneath narrow and pull back, and the skin above sags into deep folds. Bold white sans-serif caption with thick black outline across the lower third: BLOOD VESSELS SHRINK. Vertical 9:16 composition.
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