In 19th-century Philippine colonial architecture, bahay na bato houses extensively used the capiz-shell window element. Designed to take advantage of tropical cool breezes, these houses' large windows were built at least a meter high and as wide as five meters. The typically sliding panels with conchas or lattice work (muntins) that would carry the windows' capis panes would be drawn shut when there is too much wind, with the house still taking in daylight during the storm.9
In the year 2000, there were at least 27 natural kapis beds in the Philippines, the major sources being in Sapian Bay and Roxas City, Capiz; Oton and Tigbauan, Iloilo; San Miguel Bay in Camarines Norte and Camarines Sur; Hinigaran and Pontevedra, Negros Occidental; Mangarin Bay in Mindoro Occidental; and Panguil Bay in Misamis Occidental.10
Rustia, Jessica M.; Antonino, Judith P.; Velasco, Ravelina R.; Lima, Marcelo A.; Yates, Edwin Alexander; Fernig, David G. (August 31, 2023). History and Prospects for Sustainability and Circularity of the Windowpane Oyster Placuna placenta Fishery in the Philippines. https://www.researchgate.net/publication/373615716 ↩
"Capiz Shell - Arca del Gusto". Slow Food Foundation. Retrieved August 8, 2024. https://www.fondazioneslowfood.com/en/ark-of-taste-slow-food/capiz-shell/ ↩
matichub (March 14, 2021). "Capiz Shells (Placuna placenta)". Matic Hub. Retrieved August 9, 2024. https://maticph.wordpress.com/2021/03/14/capiz-shells-placuna-placenta/ ↩
"Capiz Windows - A new look from long before I was born". LumberJocks Woodworking Forum. August 17, 2007. Retrieved August 9, 2024. https://www.lumberjocks.com/showcase/capiz-windows-a-new-look-from-long-before-i-was-born.45201/ ↩
"Fisheries and aquaculture of window-pane shells". Malacological Society of London. Retrieved on 2011-10-23. http://www.malacsoc.org.uk/malacological_bulletin/Mini-Reviews/3Aquaculture/Aquaculture.htm ↩
National Museum of the Philippines (June 11, 2020). Placuna placenta: Capis Shells and Windows to Indigenous Artistry. Retrieved August 9, 2024 – via YouTube. https://www.youtube.com/watch?v=BTpyLDCaero ↩
"Capiz Shell Use in Laurel House - 01 PDF | PDF | Window | Art Media". Scribd. Retrieved August 9, 2024. https://www.scribd.com/document/440466259/CAPIZ-SHELL-USE-IN-LAUREL-HOUSE-01-pdf ↩
Adan, RIY (July–August 2000). "The window-pane (kapis shell) industry" (PDF). SEAFDEC Asian Aquaculture. XXII (4): 23 and 31 – via Core.ac.uk. https://core.ac.uk/download/pdf/33722599.pdf ↩