Quick, do an experiment: Whip out your phone and take a short video. Trees outside your window, the other people in line with you, whatever.
Now here's a question: How did you shoot it? Did you hold the phone sideways, to get a horizontal, or landscape, shot? Or did you hold it vertically? Odds are you held it upright, which means you're helping to accelerate one of the most underappreciated shifts in the mediascape.
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