{"schema": "too.foo.history.image-prompt.v1", "slug": "1886-11-11-heinrich-hertz-verifies-the-existence-of-electromagnetic-waves-at-the", "release": "4b157fe58dc3a255", "image_key": "1886-11-11-heinrich-hertz-verifies-the-existence-of-electromagnetic-waves-at-the", "image_sha256": "55da0f9129a0e62dfda894a43e1356dba964015d5bd68f362df7189811bc7bf1", "job": "20260825-013205-tier1", "model": "Ideogram 4 (fp8)", "preset": "V4_QUALITY_48", "steps": 48, "seed": 20260823, "width": 1216, "height": 832, "caption_mode": "json", "caption": {"high_level_description": "In a blacked-out lecture hall a man crouches with his face a hand's width from a copper wire ring on a wooden stand, watching a single pinprick spark at the ring's hairline gap, while several metres away across bare floor a spark-gap oscillator between two large square metal plates throws its own bright short spark. A tiered lecture hall of a German technical college in November 1886: steeply raked wooden benches rising into darkness, a long demonstration table, windows blanked out with dark cloth, a large induction coil and a battery of glass cells on a side trolley, bare floorboards, a stopped wall clock face turned away. the two brass balls with the transmitter spark are mounted between the two large metal plates on the same demonstration table. the copper ring on its stand sits several metres away across bare open floor, its two wire ends closing only on themselves at the gap. the crouching man's face is a hand's width from the ring's gap, on the far side of that open floor. The copper ring is about the width of a dinner plate; the spark at its gap is a single point about the size of a pinhead, while the transmitter's spark several metres away is a short bright line about a finger's width long. It is 1886, Karlsruhe: dark three-piece suits with stiff white collars, a trimmed beard; bare copper wire, sheet zinc and brass, varnished wood, hand-blown glass battery jars, plain floorboards; a Ruhmkorff induction coil with a vibrating interrupter, wet-cell batteries, a spark-gap oscillator with plate capacitance, a hand-adjusted micrometer screw on the ring gap. The receiver spark is a single pinprick of blue-white light; the room stays black except for the two sparks, and the air between the two apparatus stays plain dark.", "style_description": {"aesthetics": "An invisible thing announcing itself as a spark you have to sit in the dark to see. Documentary photographic realism: subtle film grain, believable wear on every material, candid imperfect framing.", "lighting": "Near total darkness; the transmitter spark is the only real light source, throwing a hard brief blue-white edge on the man's face and the ring's copper", "photo": "35mm, f/1.8, 4 m, medium-wide from floor level, the lit ring and crouching man in the near right, the sparking oscillator small and bright in the far left, dark floor between", "medium": "photograph, Blacked-out room and a long dark-adapted exposure, the only way the receiver spark can be seen at all", "color_palette": ["#1E1913", "#4A3B28", "#8A7350", "#C9B892", "#2B2B2A"]}, "compositional_deconstruction": {"background": "A tiered lecture hall of a German technical college in November 1886: steeply raked wooden benches rising into darkness, a long demonstration table, windows blanked out with dark cloth, a large induction coil and a battery of glass cells on a side trolley, bare floorboards, a stopped wall clock face turned away. Near total darkness; the transmitter spark is the only real light source, throwing a hard brief blue-white edge on the man's face and the ring's copper.", "elements": [{"type": "obj", "bbox": [420, 620, 620, 800], "desc": "a circle of stout bare copper wire about the width of a dinner plate, mounted upright on a plain wooden stand, its two ends brought together to a gap narrower than a hair, adjusted by a small screw", "color_palette": ["#A9713C"]}, {"type": "obj", "bbox": [527, 700, 543, 716], "desc": "one minute blue-white spark at the ring's gap, a single star-like point about the size of a pinhead", "color_palette": ["#CFE0FF"]}, {"type": "obj", "bbox": [300, 760, 900, 1000], "desc": "a young bearded man in a dark suit crouched low with his face about a hand's width from the ring's gap, one hand steadying the stand, eyes wide and fixed, his features lit only by the distant transmitter spark"}, {"type": "obj", "bbox": [380, 80, 700, 400], "desc": "two large square sheet-metal plates standing upright about a metre apart on the demonstration table, joined by stout rods ending in two polished brass balls with a short gap between them, a bright short white spark crossing that gap", "color_palette": ["#B8BCC0", "#DCE8FF"]}, {"type": "obj", "bbox": [440, 0, 760, 120], "desc": "a long induction coil on a wooden base with a vibrating interrupter and thick wires, on a side trolley with a rank of glass battery cells beneath it"}, {"type": "obj", "bbox": [0, 0, 1000, 1000], "desc": "steeply raked wooden benches rising into complete darkness behind, windows covered with dark cloth, bare floorboards between the table and the ring stand"}]}}, "rendered_input": "{\"high_level_description\": \"In a blacked-out lecture hall a man crouches with his face a hand's width from a copper wire ring on a wooden stand, watching a single pinprick spark at the ring's hairline gap, while several metres away across bare floor a spark-gap oscillator between two large square metal plates throws its own bright short spark. A tiered lecture hall of a German technical college in November 1886: steeply raked wooden benches rising into darkness, a long demonstration table, windows blanked out with dark cloth, a large induction coil and a battery of glass cells on a side trolley, bare floorboards, a stopped wall clock face turned away. the two brass balls with the transmitter spark are mounted between the two large metal plates on the same demonstration table. the copper ring on its stand sits several metres away across bare open floor, its two wire ends closing only on themselves at the gap. the crouching man's face is a hand's width from the ring's gap, on the far side of that open floor. The copper ring is about the width of a dinner plate; the spark at its gap is a single point about the size of a pinhead, while the transmitter's spark several metres away is a short bright line about a finger's width long. It is 1886, Karlsruhe: dark three-piece suits with stiff white collars, a trimmed beard; bare copper wire, sheet zinc and brass, varnished wood, hand-blown glass battery jars, plain floorboards; a Ruhmkorff induction coil with a vibrating interrupter, wet-cell batteries, a spark-gap oscillator with plate capacitance, a hand-adjusted micrometer screw on the ring gap. The receiver spark is a single pinprick of blue-white light; the room stays black except for the two sparks, and the air between the two apparatus stays plain dark.\", \"style_description\": {\"aesthetics\": \"An invisible thing announcing itself as a spark you have to sit in the dark to see. Documentary photographic realism: subtle film grain, believable wear on every material, candid imperfect framing.\", \"lighting\": \"Near total darkness; the transmitter spark is the only real light source, throwing a hard brief blue-white edge on the man's face and the ring's copper\", \"photo\": \"35mm, f/1.8, 4 m, medium-wide from floor level, the lit ring and crouching man in the near right, the sparking oscillator small and bright in the far left, dark floor between\", \"medium\": \"photograph, Blacked-out room and a long dark-adapted exposure, the only way the receiver spark can be seen at all\", \"color_palette\": [\"#1E1913\", \"#4A3B28\", \"#8A7350\", \"#C9B892\", \"#2B2B2A\"]}, \"compositional_deconstruction\": {\"background\": \"A tiered lecture hall of a German technical college in November 1886: steeply raked wooden benches rising into darkness, a long demonstration table, windows blanked out with dark cloth, a large induction coil and a battery of glass cells on a side trolley, bare floorboards, a stopped wall clock face turned away. Near total darkness; the transmitter spark is the only real light source, throwing a hard brief blue-white edge on the man's face and the ring's copper.\", \"elements\": [{\"type\": \"obj\", \"bbox\": [420, 620, 620, 800], \"desc\": \"a circle of stout bare copper wire about the width of a dinner plate, mounted upright on a plain wooden stand, its two ends brought together to a gap narrower than a hair, adjusted by a small screw\", \"color_palette\": [\"#A9713C\"]}, {\"type\": \"obj\", \"bbox\": [527, 700, 543, 716], \"desc\": \"one minute blue-white spark at the ring's gap, a single star-like point about the size of a pinhead\", \"color_palette\": [\"#CFE0FF\"]}, {\"type\": \"obj\", \"bbox\": [300, 760, 900, 1000], \"desc\": \"a young bearded man in a dark suit crouched low with his face about a hand's width from the ring's gap, one hand steadying the stand, eyes wide and fixed, his features lit only by the distant transmitter spark\"}, {\"type\": \"obj\", \"bbox\": [380, 80, 700, 400], \"desc\": \"two large square sheet-metal plates standing upright about a metre apart on the demonstration table, joined by stout rods ending in two polished brass balls with a short gap between them, a bright short white spark crossing that gap\", \"color_palette\": [\"#B8BCC0\", \"#DCE8FF\"]}, {\"type\": \"obj\", \"bbox\": [440, 0, 760, 120], \"desc\": \"a long induction coil on a wooden base with a vibrating interrupter and thick wires, on a side trolley with a rank of glass battery cells beneath it\"}, {\"type\": \"obj\", \"bbox\": [0, 0, 1000, 1000], \"desc\": \"steeply raked wooden benches rising into complete darkness behind, windows covered with dark cloth, bare floorboards between the table and the ring stand\"}]}}", "prompt_sha256": "653998c651348325d5ad81632fe95a29090ac3297a9ed033cce85c92185290b7"}