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        Whether it's in a movie theater, on TV or on a computer screen, the videos you watchhave almost always been horizontal. The rise of smartphones has quietly rotated that standard90 degrees, with people -- particularly young mobile users— _(20)__ long-held ideasabout the "right" way to capture video.
        On Snapchat, one of the most popular apps among teens and twentysomethings, verticalvideos have become the__(21)__ Sensing the shift, the Venice Company has embracedthe__(22)__ format and is betting that whether users realize it or not, they prefer watchingvideos on the go that are tall and narrow instead of short and wide.
       The company is so confident in the future of vertical video that it announced last monththat it had partnered with WPP, the world's largest ad vertising agency, and the Daily Mail toform Truffe Pig, an ad agency whose specialties will include vertical video ad development.With more than 100 million users and 2 billion video views daily, Snapchat's acceptance isforcing its competitors and advertisers to reconsider video formats as well. The__(23)__ rule for video has been to shoot in horizontal mode, which caters to people's horizontallyspread eyes. But smartphones are built vertically to__(24)__the distance between the earsand the mouth. You Tube and other early apps encouraged users to turn their phones to makevideo viewing familiar. But Snapchat rejected the approach._ (25)__four years ago withbuttons on the app placed in such a way that shooting and watching videos with the phoncupright would feel more logical.        It was a risky strategy, given the wide usage of horizontal video and the__(26)__.forvertical mode. But the calculated choice by Snapchat Chief Executive Evan Spiegel, whostudied product design at Stanford University, was ultimately a wise one. Mobile users havebecome comfortable reading emails, scrolling through photos and watching vidcos without__(27)__ their phones. McBride, 28, who goes by the Snapchat user name Shonduras, said he appreciates thein-your-face perspective of vertical videos and the fact that it feels natural. "If something coolhappens -- a deer runs across the road -- you don't think, 'I'm going to turn my cellphonehorizontally and get a really good shot,'"' he said, noting that "99.89%" of the Snapchatmessages he receives from fans are in __(28)__.
       If more apps prioritize vertical videos__(29)__ platforms in which content producerscan make money, it's going to become "very worthwhild toward buildingvertically," said Kathleen Grace, chief creative officer o lio New FormDigital.
【題組】20.