Megan Verlee

Bighorn Sheep Canyon in Colorado holds a chuckling ribbon of water, with a highway running alongside. Artist Christo wants to drape sections of it — almost 6 miles' worth — with long, billowing panels of silvery fabric.

"The silver-color fabric panel will absorb the color," he says. "In the morning, it will become rosy, in the middle of the day, platinum, and [during] the sunset, the fabric will become golden."

Like a lot of smartphone users, Rolando Terrazas, 19, uses his iPhone for email, text messages and finding a decent coffee shop. But Terrazas' phone also sometimes serves as his eyes: When he waves a bill under its camera, for instance, the phone tells him how much it's worth.