Google's Project Ara lets you build your own phone (hands-on pictures)

The Spiral 2 is Google's second prototype of a modular phone built under its Project Ara. These phones will let you mix and match hardware parts, such as cameras or screens.

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Spiral 2: Google's new Project Ara prototype

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Up to eight modules

Google's second prototype under Ara, the Spiral 2, can hold up to eight different modules on its rear side.

For its final version, Google promises all modules will be interchangeable, which might allow users to put a camera in the place where it best fits her/his needs.

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Different modules

Individual parts -- like cameras, screens or processors -- snap onto the phone's frame.

That means you could theoretically choose a camera from one manufacturer, a display from another, and a processor from yet another hardware maker to build the specific phone want.

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Inside the hood

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The 'skeleton head'

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It's like playing with Lego

Different modules have different sizes and each one has only one connection. It is necessary that each connection ties in with the skeleton of the phone to work properly. For example, in this picture we can see in the lower end the display module from the back.

Read: Google to test build-it-yourself Ara smartphones in Puerto Rico.