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crwdns2933797:0Jeff Suovanencrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Jeff Suovanen

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[* black] Time for another Science with iFixit!
[* black] So, just how does the Fire Phone know where your mug is in relation to the phone, thus creating that fancy 3D effect?
-[* black] There's four [http://en.wikipedia.org/wiki/Infrared|IR] projectors close to the corner of each phone. They're blasting you with non-human-visible infrared rays any time you're staring at the phone (and the display is on).
-[* black] There's also four IR cameras capturing this information at every corner of the phone.
+[* black] There are four [http://en.wikipedia.org/wiki/Infrared|IR] projectors, one near each corner of the phone. They're blasting you with non-human-visible infrared rays any time you're staring at the phone (and the display is on).
+[* black] There are also four IR cameras capturing this information—one at every corner of the phone.
[* black] The Fire Phone ~~triangulates~~ rectangulates your position, figures out that there's a human face looking at the display, and starts doing its wonderful joojoo magic — all in real time.