Google's working on a prototype tablet that will use sensors to map the world around it, says a new report.

The tablet comes out of Google's Project Tango research effort, from which we've already seen a prototype smartphone that could create a 3D map of the user's surroundings.

The Tango tablet will have a seven-inch screen, two rear cameras and infrared depth sensors, allowing the device to take accuracte 3D images of objects, according to The Wall Street Journal.

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Apparently Google plans to produce around 4,000 prototype tablets in the next month, possibly to give to developers at I/O.

Like its Tango smartphone, this means that devs will be able to experiment with the new hardware and build apps that use the new hardware in interesting ways.