Today we start round two of our weekly online-only feature “Variations on a Theme,” in which we devote digital ink to a topic that fascinates us. This week, it’s architecture.

Every weekday morning and at various points throughout the week, Reader staffers and occasional guest contributors will produce a post—a personal essay, a longer-form reported story, a photo gallery, or something more off-the-wall—on a respective theme. The theme will often tie into the previous week’s lead feature story, but not always. We’ll be creating a unified online issue that supplements what we do in print and sustains the conversation around topics we think matter. Every entry in our “Variations on a Theme” series will be updated with links to the rest of the week’s entries at the bottom of the post, and you can read an aggregated feed of the week’s entries by clicking the tag at the top of each post.