… an emergent discipline called “responsive architecture” has begun asking how physical spaces can respond to the presence of people passing through them.

A List Apart’s Ethan Marcotte on “Responsive Web Design”

Also…

Fluid grids, flexible images, and media queries are the three technical ingredients for responsive web design, but it also requires a different way of thinking. Rather than quarantining our content into disparate, device-specific experiences, we can use media queries to progressively enhance our work within different viewing contexts.