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A US-based Doctor Who fan has built a model of the Tardis designed to look bigger on its inside than its outside.

Rather than circumvent the laws of physics Greg Kumparak has relied on augmented reality (AR).

The actual interior of his wooden model features a zebra-striped fabric.

But when a smartphone is held in front of it running an AR app, it appears to show a spacious interior modelled on the ninth and tenth Doctors' time machine.

Mr Kumparak, former mobile editor at the Techcrunch news site, said he decided to embark on the project over his Thanksgiving break.

He had carved the exterior out of wood, painted it blue and attached a working light to its top before coming up with the idea of creating the illusion that the inside was huge.

"There's a running gag in Doctor Who, wherein new characters are always dumbstruck by the Tardis being bigger on the inside than it appeared on the outside," he wrote on his blog.

Greg Kumparak Mr Kumparak said he came up with the idea after watching a "crazy ridiculous" amount of Doctor Who.

"Once I realised I had a rough idea of how to pull that off, I couldn't not do it."

To bring his idea to life, the Silicon Valley-based designer first created a 3D computer model of the Tardis's interior using the free-to-use open source computer software programme Blender.

He then used the Unity graphics rendering engine - commonly used by independent video games developers - and Vuforia - an AR app development platform made by the chip maker Qualcomm - to allow a smartphone to interact with his creation.

The only problem was that the software needed to latch onto a specific part of the model to be able to map out the appropriate view of the Tardis's interior.

Mr Kumparak initially tried using the sign on the police box's door which says: "Free for use of public", but it proved to be too small to work.

So, he ultimately detached the front door and added a piece of material with a black-and-white pattern. The smartphone software could then use this to work out which part of its camera's image should be superimposed and what angle of the interior image should be shown.

Reaction to the invention has been overwhelming positive on Twitter and YouTube - a site notorious for attracting some of the web's harshest feedback.



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It would be mighty handy these days, if houses could be bigger inside, than outside.

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The heck with that, I want to travel in time and space.

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This is pretty clever, shame it doesn't work on a physical basis, I could do with an infinite sized house that could travel in time and space

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