The coolest thing to come out of Detroit in the last 10 years is not the Chevy Volt, or even the Cadillac CTS-V coupe. In fact, it’s not a car at all. It’s a line of countertop surfacing material by Detroit-based SensiTile Systems. The concrete-based materials respond to light in strange and interesting ways that boggle the mind. The company embeds a patent pending technology—based on fiberoptics—that makes them reactive to changes in light intensity and color. Available in slabs and tiles and in different sizes, the products include Sensitile Terrazzo, Lumina, and Pixa. www.sensitile.com.