My brother in law recently bought a "tilt lens" for his camera.
I had no idea what it was but here is what I've learnt and the end result.
Tilt photography can mean "miniature faking"
Basically, it’s taking a photograph of a real-world scene and making it look like a miniature scene, such as you’d find in a model railroader’s setup.
You can either apply the effect after the photo is taken in photoshop or use a special lens.
You don’t even need to have Photoshop to make a tilt-shift photo; tiltshiftmaker.com has a free service for you, using your own photo. And of course, there’s a couple of iPhone apps as well.
The below image explains tilt photography really well I think.
Architectural photographers benefit the most from tilt-shift photography. It comes in handy whenever they’re trying to take a picture of a building from ground level. If you don’t angle the camera upwards from this perspective, you won’t get the entire building in the frame. However, if you do tilt the entire camera upwards, the top of the building bends backwards and its straight lines no longer appear straight.
To remedy this problem, architectural photographers use a tilt-shift lens. By controlling the angle of the lens, they can fit the entire building into the scene while keeping the building’s straight lines straight. - See more at: http://www.digital-photo-secrets.com/tip/1368/what-is-tilt-shift-photography/#sthash.ogg53zCL.dpuf
Below are a couple of pics by Ewan, my brother in law