He steered them toward grace notes such as a planked wall or a ceiling beam in a living room.

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During my tour, he also showed how that same wall can be used to beam in 2D or 3D video from the Web, including the International Space Station.

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Blankets, wall hangings, handbags, table runners, alpaca-wool sweaters and scarves beam as brightly as the equatorial sun, lighting up the largest and finest craft market in South America.

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The premise was attractive: beam a video, photo or presentation from your phone onto a wall or screen to view it full-size and share with others.

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