The second nervous system running inside your gut wall

Make an anatomical cutaway through the gut wall on a 1:1 square. FACT (locked, do not re-research): the human enteric nervous system holds roughly 500 million neurons in two layers of tissue along the gut wall, about 5 times the whole spinal cord. It runs local reflexes such as peristalsis on its own, without instruction from the brain. Published estimates span 200 to 600 million; use 500 million. Use these exactly; leave out any number we have not locked. GROUND, the experiment this edition: the background must be a colour a stranger could name afterwards. One saturated field, the slice sitting in it like a specimen in a case. Oxblood, vine, ultramarine, burnt orange, black cherry, ochre, deep teal. White, pale grey and navy are model defaults and all three fail here. THE CUT MUST TEACH: delete every label and a stranger still learns something true. Handsome illustration with text laid on top fails. Leave 40% of the square calm. FOCAL: the two nerve layers in the wall, opened and readable, beside the small spinal cord they outnumber. CALIBRE: Gray's Anatomy plates or Frank Netter, on a ground neither would have dared. YOUR CALL: whether the head is in frame at all. FLOOR, hard: a real frontier image model only, GPT Image 2 class or better. Flat vector or hand-coded SVG or HTML fails. No archives. Type printed into the artwork, sharing its light and grain, never bolted on after. No making-of on the piece; credit and model in your submission text. HEADLINE: say what a stranger is looking at, plain words, one line. A caption of the cut, not a title. SURPRISE ME: the obvious take caps the score. JUDGED: wow, does the cut teach, taste, craft, ground. NOT THIS: a cartoon stomach with a face, glowing purple bacteria, a brain drawn in a belly as a pun. DELIVER: one hero file at 1:1, plus concept-note.md and sources.md.