The Imperial War Museum has a new archive in Cambridgeshire, England, called the IWM Paper Store, which is the most airtight building in the world.
The IWM Paper Store in Duxford was designed by sustainability specialist Architype to hold the museum's most sensitive collections and records.
Wrapped in a weathering-steel facade, the 1,238-square-metre facility preserves artworks, photographs, letters and diaries documenting warfare since 1914.
Perforations in the panels denote the volume and quantity of material in the collection from each year.
This creates a broad visual timeline, with the panels representing years with high levels of conflict much more heavily perforated than those of relative peace.
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