AI videoOctober 2026

How Charles Bridge was really built

Emperor Charles IV in black sunglasses runs a tower crane, tastes the egg mortar and sets the last stone from a helicopter. One prompt, 30 seconds, eight beats in a single multishot generation.

Seedance 2.5Nano Banana Pro30 s

From brief to result

How I made it

01
Prepare the main character
I based the Charles IV reference on his bust in St. Vitus Cathedral. The crown, cloak and black sunglasses create a shared visual anchor for every scene.
02
Lock the world and lighting
A second reference defines the bridge construction site, medieval Prague and warm afternoon light. It is separate from the character reference.
03
Build the thirty-second sequence
I divided eight scenes into timed beats. The prompt starts with the look and continuity rules, followed by action and specific sounds. The result is one multishot generation.

Generation inputs

References and their prompts

@Image1

Face and costume modelled on the Charles IV bust in the St. Vitus Cathedral triforium.

Image promptNano Banana Pro

Medium close-up portrait, chest up, of Emperor Charles IV of Bohemia standing on a muddy medieval construction site on the Vltava riverbank in Prague, 1357, modelled closely on his 14th-century Parler workshop bust in the St. Vitus Cathedral triforium: a long narrow face, high cheekbones, a distinctly hooked aquiline nose, shoulder-length wavy brown hair, a full brown beard with grey strands trimmed to a soft point, a moustache, age about 40, weathered sunburned skin with pores and fine lines. He wears a gold Gothic lily crown with red and blue cabochon stones, a crimson wool mantle with a thick ermine collar, a dark burgundy tunic, a gold belt, specks of mud on the mantle. Modern black sunglasses with slim frames. Completely serious, looking off to the side at the work, not at the camera. Behind him, soft and slightly out of focus: wooden scaffolding, smoke from a lime kiln, masons in linen shirts, the river. Handheld smartphone-camera look: wide 24mm lens, deep focus, slight HDR, mild digital sharpening. Late afternoon golden hour, low warm sun raking from the left, warm amber haze, dust in the air. Lifted soft blacks, highlights never clipped, warm earthy low-saturation grade. 100% photorealistic, real skin texture, no CGI look, no plastic skin. Clean frame, no timestamp, no date stamp, no on-screen text, no recording UI, no logos.

@Image2

World and grade: the half-built bridge on the Vltava in 1357.

Image promptNano Banana Pro

Wide establishing shot from the muddy Old Town riverbank of the Vltava in Prague, 1357. The Charles Bridge has just begun: only two rough sandstone arches stand in the river near the far bank, the rest of the crossing is rows of wooden piles, timber falsework and rope-lashed wooden scaffolding, wooden treadwheel cranes, rafts of timber on the water. Across the river on the hill: a Gothic Prague Castle with the St. Vitus Cathedral choir unfinished and wrapped in wooden scaffolding, a medieval wooden crane on its roof. Below it only Gothic stone towers, timber houses and wooden roofs. No Baroque buildings, no domes, no statues on the bridge, no modern bridges, no metal scaffolding. Among all the medieval timber stands one single modern yellow tower crane, dirty and weathered. Foreground: a dug-up mud road with deep ruts and puddles, piles of sandstone blocks, an ox cart stuck in the mud, masons in dirty linen shirts and hoods hauling stone, thick smoke drifting from lime kilns and fires, dust hanging in the air. Handheld smartphone-camera look: wide 24mm lens, deep focus, slight HDR, mild digital sharpening. Late afternoon golden hour, low warm sun raking from the left through the smoke, long shadows, warm amber haze. Gritty and dirty, lifted soft blacks, highlights never clipped, warm earthy low-saturation grade. 100% photorealistic, no CGI look. Clean frame, no timestamp, no date stamp, no on-screen text, no recording UI, no logos.

The exact video prompt

Video promptSeedance 2.5 · 30 s · 4:3

HARD RULES: The same man from @Image1 is the hero in every shot: Emperor Charles IV of Bohemia, same face, same beard, gold Gothic crown, mud-stained crimson mantle with ermine collar, black sunglasses that never come off. The world, light and grade match @Image2: muddy 14th-century Prague building site on the Vltava, half-built stone bridge, Gothic Prague Castle in scaffolding, modern construction gear mixed with medieval timber. Everyone stays completely serious, nobody laughs, nobody looks at the camera. No dialogue, no music, only natural SFX. Clean frame, no timestamp, no date stamp, no on-screen text, no recording UI, no logos.

LOOK: handheld smartphone-camera look, wide 24mm lens, deep focus, slight HDR, natural micro-shake, quick digital punch-in zooms on the gags. Late afternoon golden hour, low warm sun raking through smoke and dust, long shadows, warm earthy low-saturation grade, lifted soft blacks. Gritty, dirty, mud everywhere. 100% photorealistic live action, real skin, no CGI look, no morphing.

0:00-0:03 Wide handheld shot from the muddy riverbank: medieval masons strain to roll a huge sandstone block on wooden logs toward the half-built bridge. Behind them a modern yellow tower crane swings its boom over the wooden scaffolding. Quick punch-in zoom to the crane cab high above.
0:03-0:06 Inside the crane cab: Charles IV works the joystick with total focus, a sandstone block swings past the dusty window, the Gothic castle behind.
0:06-0:10 Next to a mud-caked modern concrete mixer truck, masons crack hundreds of eggs from wicker baskets into the spinning drum. Charles IV steps in, dips one finger into the mortar, tastes it, and gives one slow approving nod. Punch-in on his face.
0:10-0:14 A huge humanoid clay golem carries a sandstone block alone through the mud while masons sit on stones drinking beer from clay tankards. Charles IV walks in, points sternly back to work, then turns and stalks away irritated, mantle swinging.
0:14-0:18 A muddy medieval market square in the Old Town: Charles IV glides on a modern electric kick scooter between stalls of cabbages and gingerbread. A goose runs across his path, he swerves and crashes straight into the cabbage stall, cabbages rolling into the mud.
0:18-0:20 Hard cut: Charles IV calmly drives an old red tractor across the stone bridge, sunglasses on, as if nothing happened.
0:20-0:23 Drone rising over a wide field below the castle: hundreds of peasants in linen shirts stand in perfect rows performing synchronized mass gymnastics, arms rising together, Charles IV in front blowing a whistle like a strict instructor.
0:23-0:27 Charles IV pilots a modern military helicopter, a huge sandstone block hanging beneath it on steel cables, rotor wash blasting dust and smoke across the bridge site. The block sets down on top of the Gothic bridge tower, the cables release, the helicopter peels away.
0:27-0:30 Hard cut: the finished Charles Bridge in the same golden light, suddenly packed shoulder to shoulder with modern tourists holding selfie sticks and chimney cakes. Slow punch-in to the helicopter hovering above: inside, Charles IV slowly takes off his sunglasses and stares. Hold.

SFX: mud squelch, ropes creaking, crane hydraulics and beeping, eggs cracking, mixer drum rumble, clay footsteps, tankards clinking, scooter whine, goose honking, crash of cabbages, tractor engine, whistle, rotor thunder, crowd murmur and camera shutters at the end.

Know-how