In Pre-WWII Berlin, the Shape of Your Roof Was a Highly Political Decision | Atlas Obscura | Link

http://www.atlasobscura.com/articles/the-heated-highly-political-roof-war-that-captivated-berlin-before-world-war-ii

Leonieke autoposts, Link, WWWorld

Modernists favored flat roofs, while conservatives preferred them pitched. They collided on a single street in the capital.