Clamber up, slide down; gaze in awe at the wildlife that miraculously survives in this sea of sand; and be ready to take many photos as the colors of the dunes change constantly.

攀爬或是滑落，你会看见动物在这片沙漠之中如何奇迹般的生存，心存敬畏。准备好相机，这沙丘的颜色转瞬即变。

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Petraeus and his staff will discuss at length the shading of colors on a slide, or the direction of arrows depicting causality.

NEWYORKER: The General��s Dilemma

You can swipe through images of up to four at time, slide the specs up and down your nose, favorite ones you like, change colors, share choices with your friends, and then pick up to four the company will ship to you to try on for real at home.

FORBES: Hate Trying On Glasses? A New App Ends The Misery