Katy Perry's videos are a reflection of her colourful worldview, which is buoyed by bold self-empowerment (the lush, jungle-set "Roar") and over-the-top whimsy (the dessert wonderland of "California Gurls"). Still, the pop icon's glasses aren't always rose-coloured; look no further than the surreal amusement park depicted in "Chained to the Rhythm", which reveals a pointed critique of modern society.