When working on complex Sass architectures, it is not uncommon to use Sass maps to maintain configuration and options. From time to time, you’ll see maps within maps (possibly on several levels) like this one from o-grid: $o-grid-default-config: ( columns: 12, gutter: 10px, min-width: 240px, max-width: 1330px, layouts: ( S: 370px, // ≥20px columns M: 610px, // ≥40px columns L: 850px, // ≥60px colu