The unusual `Ark Nova`, a giant purple balloon made of a coated polyester material has been erected at a park in the town of Matsushima of Miyagi Prefecture, the Japan Times reports.

Anish Kapoor addresses a press conference in Berlin. Pic: AFP

The innovation was Kapoor’s joint venture with Japanese architect Arata Isozaki.

World's first inflatable concert hall in the disaster-hit town of Matsushima.Pic: AFP

The structure reportedly measures about 18 metres high and 35 metres wide, when fully inflated, creating enough room for about 500 people.

The balloon can be easily deflated and travel around the region to host events, the report added.