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Heat Maps

The new visualization vogue lets you see trends at a glance.

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Heat maps are useful for everything from where to place your Google ads to sussing out rent prices in your city. They sometimes even approach the level of art.

Editorial note: Whoa! You've found a super-old post here on BuzzFeed, from an earlier era of the site. It doesn't really represent where we are anymore, and may in fact be totally broken, but we're leaving it up as a part of our early history.

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