Tokyo: Kazutoshi Obana's grey, hooded coat doesn't just keep him dry in a downpour. It can also make him seem invisible.
On a clear day at Tokyo University, Obana stands outside and dons the coat, as students and teachers walk by. Viewed through a special projector lens, the people behind him suddenly appear as images in a fuzzy, greenish tint on his coat - as if he were see-through.
"This is a kind of augmented reality," said Susumu Tachi, a Tokyo University professor of computer science and physics, during the recent demonstration of his invention.
Tachi, who is also the founding head of the Virtual Reality Society of Japan, designed the coat using microscopic reflectors which act like a movie screen. They can even reflect images when the material is wrinkled.
In fact, Tachi's "invisibility" coat is something of a camera trick.