This is not an attempt to reawaken bad memories of high school math class. The picture was shot inside the Old Cathedral, a/k/a the Basilica of St. Louis, King. It was build in 1834 (ancient by local standards) and stands on the ground of the Arch. King? You knew our city was named after the canonized Louis IX, Roi de France, didn't you? The interior feels more like a colonial-era New England Congregationalist church than a Catholic cathedral, with its plain white walls and clear windows. The window grid reminds me of the Arch's underlying mathematics, which they didn't teach us in high school in The Bronx. I wouldn't have gotten it anyway.