The only growing non-digital ad medium

Out of home (OOH) ads — including billboards, subway posters, beach airplane ads and more — are the only type of traditional ad medium that is still growing, according to Magna's latest ads forecast.

Why it matters: Out of home placements are growing as they become more digital and can be bought and sold in an automated fashion, or programmatically. There's also an appeal to out of home ads, because it's hard for viewers to block them out. (You can't set up an ad-blocker to avoid ads on your subway commute.)