There has been much speculation about the Nexus 6P's big black glass bar. What does it do? Why is it so big? Why does it kind of look like a Cylon head? Well, the answer is that, unsurprisingly, it's just form following function. You see, because the 6P is predominantly made of aluminum, which acts as a reflector to various radio and other wireless signals in the device, there needs to be a place for antennas to send out their various signals. You can accomplish this with ceramic or plastic inserts like HTC or Apple, or you can construct portions of the phone from different materials (like glass) to help those precious wireless communiques get out.

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