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When I was younger, I used to love playing the game 20 Questions. You know, "Person, place or thing?" If you'd chosen the category "thing" then my first question would always be "Is it bigger than a breadbox?" Now you can replace "breadbox" with "iPhone."
Billy Chasen has created a digital and accurate image of a ruler, and it's quite aptly named Ruler for iPhone. It's been configured to fit the whole of your iPhone screen in its entirety. Why? So you can measure things, of course. At just over 2.5 inches, you'll have a new "standard" for measurements. How wide is your new collectors Harry Potter lunchbox? Oh, lets see... about the length of an iPhone.