Domain: Healthcare — Pathology
Target concept: Edema (Pulmonary edema)

Video generation prompt: A lung tissue specimen from a patient with chronic heart failure is placed on the laboratory bench, and the contents of the alveolar spaces are observed under the microscope.

Evaluation guide:
(i) Target concept: Transudative pulmonary edema secondary to left ventricular failure.
Minimum mechanism: Elevated left atrial pressure → passive backpressure in pulmonary capillaries → hydrostatic imbalance favoring fluid filtration over reabsorption → accumulation of protein-poor fluid in alveolar airspaces.
(ii)Storyline: [Phase 1: Macro setup] Lung specimen rests centrally on neutral-toned lab bench; microscope sits adjacent, in focus, with stage accessible. [Phase 2: Transition] Camera smoothly approaches specimen → aligns with microscope eyepiece/lens → field narrows. [Phase 3: Microscopic view] Stable, centered field reveals repeating hexagonal alveolar units bounded by thin, continuous walls; lumens uniformly occupied by featureless, pale pink material with no air gaps, cells, or foam. Perspective remains fixed; no rotation, tilt, or parallax shift; all visibility constraints satisfied by full-frame coverage of representative alveolar region.

Manual:
Experimental Procedure
1. Place lung tissue specimen from chronic heart failure patient on laboratory bench.
2. Position light microscope adjacent to specimen.
3. Observe alveolar spaces under microscope at medium magnification.
Observation of Experimental Phenomena
Alveolar spaces are filled with homogeneous, pale pink, acellular fluid; alveolar walls remain intact and evenly spaced; no red blood cells or inflammatory cells present.
Summary of Experimental Principles
Chronic heart failure causes increased pulmonary venous pressure → transudation of plasma ultrafiltrate into alveolar spaces → pulmonary edema; histologically appears as eosinophilic fluid filling alveoli without wall disruption.

Prompt Grounding rubric:
level_1: No lung tissue specimen is shown on the bench; or no microscope is shown; or there is no transition to any microscopic view; none of the three core elements (specimen, bench, microscope) appears.
level_2: The bench or the microscope appears, but no lung specimen is identifiable on it; or there is no shift from the bench view to a microscopic view; nothing suggests specimen-placement followed by observation.
level_3: A lung specimen sits on the bench, a microscope is present, and the shot shifts to a microscopic view, but that microscopic view does not show recognizable alveolar walls or airspaces.
level_4: Everything at level 3 is still true, and the final microscopic view is now centered and clearly shows alveolar walls forming distinct airspaces; however, whatever fills those airspaces cannot yet be visually told apart from ordinary open, air-filled alveoli.
level_5: Everything at level 4 is still true, and on top of that the airspaces are visibly filled with a uniform, pink-tinged material rather than appearing open and empty; the specimen, bench, and microscope are unambiguous in identity and in the order they appear.

Scientific and Causal Correctness rubric:
level_1: The alveolar spaces look completely air-filled (dark, open voids), dry, or collapsed; no fluid is visible; the color matches ordinary aerated lung tissue; nothing pathological is shown.
level_2: The alveolar spaces show a patchy or bubbly, foam-like appearance that doesn't match transudative fluid; or cellular debris, blood, or frothy material appears, which is inconsistent with heart-failure-associated pulmonary edema; or the filling material is blue, green, yellow, or brown rather than pale pink.
level_3: The alveolar spaces contain a uniform, cell-free, pale pink material consistent with transudative edema fluid; the alveolar walls stay intact and evenly spaced; there is no hemorrhage, inflammation, or scarring, matching the expected appearance of heart-failure-induced pulmonary edema.
level_4: Everything at level 3 is still true, and on top of that the pale pink fluid fills at least 80% of the visible alveolar airspaces across the field; the alveolar walls show no thickening, distortion, or breaks; nothing (stain residue, dust, blur) obscures the fluid's appearance.
level_5: Everything at level 4 is still true, and on top of that the fluid's edge against each alveolar wall is sharp and continuous, with no air bubbles or foam breaking it up; the pink color is even across every visible alveolus with no streaking or fading; every alveolus in the field shows essentially the same fluid-filled appearance.

Spatiotemporal Consistency rubric:
level_1: The specimen appears on the bench with no placement motion; the microscope appears or disappears abruptly; the shot cuts to the microscopic view with no visible transition; the lighting changes sharply between shots; the bench surface changes texture or shape mid-sequence.
level_2: One clear break in continuity occurs: the specimen jumps from off-center to centered with no motion shown; the view jumps from the bench directly to the microscopic field with no zoom or focus transition; the shadow cast on the bench switches side between two consecutive frames; the microscopic field flickers or warps with no cause.
level_3: The specimen, bench, and microscope stay in the same relative arrangement throughout; the transition into the microscopic view is shown as continuous motion (e.g., the camera moving closer, the focus narrowing) rather than a hard cut; the lighting and the direction of any cast shadow stay the same throughout; nothing appears or disappears without a visible cause.
level_4: Everything at level 3 is still true, and on top of that the shift from the bench view to the microscopic view follows a single, unbroken visual progression (camera approaches → lens focuses → field narrows to the alveolar level) with no jump back and forth and no repeated frame.
level_5: Everything at level 4 is still true, and on top of that the bench surface, the specimen's surface, and the alveolar wall texture all stay clearly resolved and free of warping or sudden brightness changes across every frame of the sequence, with no part of the scene appearing to float free of its supporting surface.