Background photographs sourced from Wikimedia Commons. All are free-licensed; credits below. bg01.jpg - File:Brutalist Architecture (181685065).jpeg by Henrique Lima · CC BY 3.0 https://commons.wikimedia.org/wiki/File:Brutalist_Architecture_(181685065).jpeg bg02.jpg - File:Brutalist Architecture (51399696479).jpg by Steven Penton from Bakers Beach, Tasmania Australia · CC BY 2.0 https://commons.wikimedia.org/wiki/File:Brutalist_Architecture_(51399696479).jpg bg03.jpg - File:20110927 Romo ß260 Sol Sort DSCN3096 DSCN3097 PtrQs.jpg by PtrQs · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:20110927_Romo_%C3%9F260_Sol_Sort_DSCN3096_DSCN3097_PtrQs.jpg bg04.jpg - File:Barbican Estate (14565813505).jpg by Alexander Svensson · CC BY 2.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_(14565813505).jpg bg05.jpg - File:Unused cladding holes - east facade - J Edgar Hoover Building - Washington DC - 2012.jpg by Tim Evanson · CC BY-SA 2.0 https://commons.wikimedia.org/wiki/File:Unused_cladding_holes_-_east_facade_-_J_Edgar_Hoover_Building_-_Washington_DC_-_2012.jpg bg06.jpg - File:MGH Kon-ya-machi Daimyō Bldg the béton brut Daimyō 1-chōme Chūō-ku Fukuoka 20250619.jpg by Hirho · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:MGH_Kon-ya-machi_Daimy%C5%8D_Bldg_the_b%C3%A9ton_brut_Daimy%C5%8D_1-ch%C5%8Dme_Ch%C5%AB%C5%8D-ku_Fukuoka_20250619.jpg bg07.jpg - File:FOT9561 Haltepunkt Leipzig Anger-Crottendorf 2024 – Personentunnel zum Treppenaufgang Süd.jpg by August Geyler · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:FOT9561_Haltepunkt_Leipzig_Anger-Crottendorf_2024_%E2%80%93_Personentunnel_zum_Treppenaufgang_S%C3%BCd.jpg bg08.jpg - File:Brutalist building side looking up.jpg by Banalities · CC BY 2.0 https://commons.wikimedia.org/wiki/File:Brutalist_building_side_looking_up.jpg bg09.jpg - File:Barbican Estate City of London 2026 04.jpg by Julian Herzog (Website) · CC BY 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_City_of_London_2026_04.jpg bg10.jpg - File:Barbican Estate 2018-09-22.jpg by Colin · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_2018-09-22.jpg bg11.jpg - File:Trellick Tower 2.jpg by Rc1959 · CC0 https://commons.wikimedia.org/wiki/File:Trellick_Tower_2.jpg bg12.jpg - File:Wallside & The Postern highwalks, Barbican Estate, London.jpg by Paul the Archivist · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Wallside_%26_The_Postern_highwalks,_Barbican_Estate,_London.jpg bg13.jpg - File:FOT9558 Haltepunkt Leipzig Anger-Crottendorf 2024 – Sichtbeton im Treppenaufgang Süd.jpg by August Geyler · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:FOT9558_Haltepunkt_Leipzig_Anger-Crottendorf_2024_%E2%80%93_Sichtbeton_im_Treppenaufgang_S%C3%BCd.jpg bg14.jpg - File:London, Barbican Estate, 2015-3.JPG by Kleon3 · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:London,_Barbican_Estate,_2015-3.JPG bg15.jpg - File:Barbican Estate City of London 2026 07.jpg by Julian Herzog (Website) · CC BY 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_City_of_London_2026_07.jpg bg16.jpg - File:Barbican Estate Frobisher Crescent City of London 2026 05.jpg by Julian Herzog (Website) · CC BY 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_Frobisher_Crescent_City_of_London_2026_05.jpg bg17.jpg - File:The Postern, Barbican Estate, London 01.jpg by Paul the Archivist · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:The_Postern,_Barbican_Estate,_London_01.jpg bg18.jpg - File:500 S. Hobart Brutalist apts.jpg by Downtowngal · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:500_S._Hobart_Brutalist_apts.jpg bg19.jpg - File:FOT9562 Haltepunkt Leipzig Anger-Crottendorf 2024 – Personentunnel zum Treppenaufgang Süd.jpg by August Geyler · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:FOT9562_Haltepunkt_Leipzig_Anger-Crottendorf_2024_%E2%80%93_Personentunnel_zum_Treppenaufgang_S%C3%BCd.jpg bg20.jpg - File:Boston City Hall Mar 2025 21.jpg by Epicgenius · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Boston_City_Hall_Mar_2025_21.jpg bg21.jpg - File:Ludwigsburg - Oßweil - Ostfriedhof - Aussegnungshalle - Verbindungsmauer - Wellenstruktur und Kiesel (RQCE2382-C).jpg by Roman Eisele · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Ludwigsburg_-_O%C3%9Fweil_-_Ostfriedhof_-_Aussegnungshalle_-_Verbindungsmauer_-_Wellenstruktur_und_Kiesel_(RQCE2382-C).jpg bg22.jpg - File:FOT9514 Haltepunkt Leipzig Anger-Crottendorf 2024 – Treppenaufgang Süd.jpg by August Geyler · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:FOT9514_Haltepunkt_Leipzig_Anger-Crottendorf_2024_%E2%80%93_Treppenaufgang_S%C3%BCd.jpg bg23.jpg - File:Brutalist architecture in Rome -1.jpg by Albarubescens · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Brutalist_architecture_in_Rome_-1.jpg bg24.jpg - File:Ludwigsburg - Oßweil - Ostfriedhof - Aussegnungshalle - Verbindungsmauer - Betonrelief (RQCE2374).jpg by Roman Eisele · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Ludwigsburg_-_O%C3%9Fweil_-_Ostfriedhof_-_Aussegnungshalle_-_Verbindungsmauer_-_Betonrelief_(RQCE2374).jpg bg25.jpg - File:Boston City Hall Mar 2025 29.jpg by Epicgenius · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Boston_City_Hall_Mar_2025_29.jpg bg26.jpg - File:Trellick Tower, August 2015 01.jpg by Edwardx · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Trellick_Tower,_August_2015_01.jpg bg27.jpg - File:Boston City Hall Mar 2025 22.jpg by Epicgenius · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Boston_City_Hall_Mar_2025_22.jpg bg28.jpg - File:Barbican Estate Water Gardens in morning.jpg by Sdkb · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_Water_Gardens_in_morning.jpg bg29.jpg - File:Boston City Hall Mar 2025 15.jpg by Epicgenius · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Boston_City_Hall_Mar_2025_15.jpg bg30.jpg - File:Boston City Hall Mar 2025 47.jpg by Epicgenius · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Boston_City_Hall_Mar_2025_47.jpg bg31.jpg - File:Boston City Hall Mar 2025 27.jpg by Epicgenius · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Boston_City_Hall_Mar_2025_27.jpg bg32.jpg - File:Barbican Estate Frobisher Crescent City of London 2026 06.jpg by Julian Herzog (Website) · CC BY 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_Frobisher_Crescent_City_of_London_2026_06.jpg bg33.jpg - File:Barbican Estate main entrance 2023 01.jpg by DaHuzyBru · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_main_entrance_2023_01.jpg bg34.jpg - File:Barbican Estate 2023 night 05.jpg by Jonathan Platteau · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_2023_night_05.jpg bg35.jpg - File:Trellick Tower 06.JPG by Edwardx · CC BY-SA 3.0 https://commons.wikimedia.org/wiki/File:Trellick_Tower_06.JPG bg36.jpg - File:Boston City Hall Mar 2025 20.jpg by Epicgenius · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Boston_City_Hall_Mar_2025_20.jpg bg37.jpg - File:James stirling, cambridge university history faculty building, 1964-1967 (4928152576).jpg by seier+seier · CC BY 2.0 https://commons.wikimedia.org/wiki/File:James_stirling,_cambridge_university_history_faculty_building,_1964-1967_(4928152576).jpg bg38.jpg - File:Ludwigsburg - Oßweil - Ostfriedhof - Aussegnungshalle - Verbindungsmauer - Mittelteil mit Efeuranken (RQCE2392).jpg by Roman Eisele · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Ludwigsburg_-_O%C3%9Fweil_-_Ostfriedhof_-_Aussegnungshalle_-_Verbindungsmauer_-_Mittelteil_mit_Efeuranken_(RQCE2392).jpg bg39.jpg - File:2017 Boston City Hall 3.jpg by Beyond My Ken · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:2017_Boston_City_Hall_3.jpg bg40.jpg - File:Béton Brut.jpg by Piotr Szotkowski · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:B%C3%A9ton_Brut.jpg bg41.jpg - File:Boston City Hall Mar 2025 03.jpg by Epicgenius · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Boston_City_Hall_Mar_2025_03.jpg bg42.jpg - File:London- Barbican Estate - 50624676826.jpg by Jorge Franganillo · CC BY 2.0 https://commons.wikimedia.org/wiki/File:London-_Barbican_Estate_-_50624676826.jpg bg43.jpg - File:Trellick Tower 07.JPG by Edwardx · CC BY-SA 3.0 https://commons.wikimedia.org/wiki/File:Trellick_Tower_07.JPG bg44.jpg - File:Barbican Estate 2023 night 03.jpg by Jonathan Platteau · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_2023_night_03.jpg bg45.jpg - File:London - Barbican Estate (7).jpg by Fred Romero from Paris, France · CC BY 2.0 https://commons.wikimedia.org/wiki/File:London_-_Barbican_Estate_(7).jpg bg46.jpg - File:MGH Kon-ya-machi Daimyō Bldg the béton brut Daimyō 1-chōme Chūō-ku Fukuoka 20250619 163442.jpg by Hirho · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:MGH_Kon-ya-machi_Daimy%C5%8D_Bldg_the_b%C3%A9ton_brut_Daimy%C5%8D_1-ch%C5%8Dme_Ch%C5%AB%C5%8D-ku_Fukuoka_20250619_163442.jpg bg47.jpg - File:Doors, Barbican Estate.jpg by Matt Brown · CC BY 2.0 https://commons.wikimedia.org/wiki/File:Doors,_Barbican_Estate.jpg bg48.jpg - File:Barbican Estate 2023 night 04.jpg by Jonathan Platteau · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Barbican_Estate_2023_night_04.jpg bg49.jpg - File:Dornbirn-Forachstraße 74-Rosa canina-sundial-02ESD.jpg by Asurnipal · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Dornbirn-Forachstra%C3%9Fe_74-Rosa_canina-sundial-02ESD.jpg bg50.jpg - File:Regati pst brutalist building.jpg by HartOve · CC BY 4.0 https://commons.wikimedia.org/wiki/File:Regati_pst_brutalist_building.jpg bg51.jpg - File:Barbican estate.jpeg by Jey86 · CC BY-SA 3.0 https://commons.wikimedia.org/wiki/File:Barbican_estate.jpeg bg52.jpg - File:London, Barbican Estate, 2015-5.JPG by Kleon3 · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:London,_Barbican_Estate,_2015-5.JPG bg53.jpg - File:Brutalist Architecture (51398152767).jpg by Steven Penton from Bakers Beach, Tasmania Australia · CC BY 2.0 https://commons.wikimedia.org/wiki/File:Brutalist_Architecture_(51398152767).jpg bg54.jpg - File:202601 Naluwan Cultural Village , Hsinchu City 02.jpg by Junyu-K · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:202601_Naluwan_Cultural_Village_,_Hsinchu_City_02.jpg bg55.jpg - File:Audimax (TU Darmstadt) 13.JPG by Cherubino · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Audimax_(TU_Darmstadt)_13.JPG bg56.jpg - File:Canmet brutalist architecture.JPG by CanmetCoop · Public domain https://commons.wikimedia.org/wiki/File:Canmet_brutalist_architecture.JPG bg57.jpg - File:London Barbican Estate 13.04.2013 10-49-05.JPG by Dirk Ingo Franke · CC BY 3.0 https://commons.wikimedia.org/wiki/File:London_Barbican_Estate_13.04.2013_10-49-05.JPG bg58.jpg - File:Audimax (TU Darmstadt) 09.JPG by Cherubino · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Audimax_(TU_Darmstadt)_09.JPG bg59.jpg - File:Elkstone Rd Trellick Tower NW532 (26620228263).jpg by Paul The Archivist · CC BY-SA 2.0 https://commons.wikimedia.org/wiki/File:Elkstone_Rd_Trellick_Tower_NW532_(26620228263).jpg bg60.jpg - File:Audimax (TU Darmstadt) 12.JPG by Cherubino · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Audimax_(TU_Darmstadt)_12.JPG bg61.jpg - File:Audimax (TU Darmstadt) 10.JPG by Cherubino · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Audimax_(TU_Darmstadt)_10.JPG bg62.jpg - File:Greater London - Trellick Tower - 2025-09-21 23-50-45 001.jpg by ThePerfidiousAlbion · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Greater_London_-_Trellick_Tower_-_2025-09-21_23-50-45_001.jpg bg63.jpg - File:Audimax (TU Darmstadt) 08.JPG by Cherubino · CC BY-SA 4.0 https://commons.wikimedia.org/wiki/File:Audimax_(TU_Darmstadt)_08.JPG bg64.jpg - File:TU Darmstadt, Audimax.jpg by No machine-readable author provided. Melkom assumed (based on copyright claims). · CC BY-SA 3.0 https://commons.wikimedia.org/wiki/File:TU_Darmstadt,_Audimax.jpg