Photo credits

Photos from Wikimedia Commons, used under the licences shown. Thanks to their authors.

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  The main facade of Casa Batlló on Passeig de Gràcia in daylight, with its wavy stone balconies, blue-green mosaic wall and tiled roof

  Kent Wang from Barcelona, Spain · CC BY-SA 2.0 · colours and contrast edited

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  Two of the bone-like balconies of Casa Batlló against the facade covered in blue, green and ochre mosaic fragments

  Richard Mortel from Riyadh, Saudi Arabia · CC BY 2.0 · colours and contrast edited

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  Passeig de Gràcia with Casa Amatller and Casa Batlló side by side under a blue sky, plane trees in front

  C messier · CC BY-SA 4.0 · colours and contrast edited

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  The stepped gable of Casa Amatller beside the tiled roof, turret and cross of Casa Batlló, seen from the street

  Fred Romero · CC BY 2.0 · colours and contrast edited

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  The facade of Casa Batlló lit at night, with the balconies and the stained-glass windows of the first floor glowing

  Tony Hisgett from Birmingham, UK · CC BY 2.0 · colours and contrast edited

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  The scaled ridge of the dragon's back on the roof of Casa Batlló, with the bulb-shaped tower topped by a four-armed cross

  Canaan · CC BY-SA 4.0 · colours and contrast edited

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  The roofline of Casa Batlló seen from the street: the tiled dragon's back, the tower with its cross and the mosaic wall below

  Jean-Christophe BENOIST · CC BY 3.0 · colours and contrast edited

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  Two of the mosaic-covered chimneys on the roof terrace of Casa Batlló against a deep blue sky

  Julian Lupyan · CC0 · colours and contrast edited

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  The central light well of Casa Batlló, its walls covered in tiles that shade from deep blue at the top to paler blue below, with the skylight above

  Julian Lupyan · CC0 · colours and contrast edited

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  The curved wooden staircase of Casa Batlló winding upward along the smooth, rounded wall

  Sara Terrones · CC BY-SA 4.0 · colours and contrast edited

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  The main salon of the noble floor of Casa Batlló with its swirling plaster ceiling, wooden floor and stained-glass windows onto the street

  Sara Terrones · CC BY-SA 4.0 · colours and contrast edited

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  The white parabolic arches of the attic of Casa Batlló, a row of smooth catenary vaults like the ribcage of an animal

  Kyle Taylor from London, 84 Countries · CC BY 2.0 · colours and contrast edited