Stained Glass Gut Architecture

You are suspended just above the belly of a living *Dugesia tigrina*, hovering at the height of a single epidermal cilium, looking upward through the body as warm transmitted light floods the scene from below like sun through medieval glass. The creature stretches to every horizon overhead — a vaulted cathedral of translucent amber tissue, its ventral membrane threaded with diagonal muscle-fiber lattices that scatter the upwelling warmth into a honeyed haze, each cellular junction edged with the faintest ghost of copper-to-aquamarine iridescence where the surrounding glycoprotein mucus bends the light. Rising deep into the interior like the ribbed nave of an ancient basilica, the triclad gut ramifies in three great ochre-brown corridors — one driving straight toward the anterior, two sweeping symmetrically to either side and subdividing into tapering diverticula whose walls, dense with phagocytic cells and partially digested matter, bleed light sideways into the surrounding parenchyma and cast warm annular halos at every branching terminus, the whole structure less a shadow than a luminous drawing pressed into living flesh. Toward the anterior horizon, where the tissue thins to near-total translucency, the two ocelli loom as the scene's most dramatic punctuation — crescent masses of dense, light-absorbing pigment cupped around photoreceptor clusters that flare at their rims into burnt-sienna halos, two dark moons haloed by atmospheric scatter, serving as the animal's sole interface with the directionality of light in a world where vision means nothing more than knowing which way the brightness lies.