Art & Tech Why Is TikTok So Hot for Cologne Cathedral? Gaping at Gothic architecture is in! A reveler poses in front of the Cologne Cathedral during the Women's Carnival Day on February 8, 2024.

The Cologne window is made of 11,500 four-inch " pixels" cut from original antique glass in a total of 72 colors. Why not 4,096? Turns out there are stained glass-smart colors, too.