Transformers

A skirt the transforms into a Coke machine.

It's not exactly a tank that changes into a giant robot, but it's a start. And it's way further along than the US is on transformer technology.

Ms. Tsukioka said her idea of the vending machine disguise was inspired by a trick used by Japan’s ancient ninja, who cloaked themselves at night under black blankets.

It's an interesting idea, but the article grew tedious. I read half of it. The slide show is cool, though.