This image is from a collection by a friend of mine, Alex Hadjidakis. He used 5 images of the Oasis 21 building in Nagoya and merged them together to create the panorama. The amazing colours come from an effect known as HDR, which I do not claim to understand at all.
You can check out more of his work at his website here.
Alex will be exhibiting this photograph as part of an exhibition of photographers from all over Japan, to be held in Tokyo this coming summer.