Support WBURImagine A Flying Pig: How Words Take Shape In The BrainPlay05:06Download AudioJon HamiltonMay 02, 2013 ShareAlthough a flying pig doesn't exist in the real world, our brains use what we know about pigs and birds — and superheroes — to create one in our mind's eye when we hear or read those words. (iStockphoto.com)