While in store, they can track trip details including tagging merchandise they liked, taking and sharing pictures with friends for instant reviews, buying surprise gifts by reviewing items liked on the store website.

FORBES: When smart phones and smart friends go shopping together

The idea of using light boxes came to him, in what admiring critics have liked to celebrate as a road-to-Damascus flash, on a bus trip in Spain in 1977.

NEWYORKER: Flashes of Light