A grand piano decorated by avant-garde artist Yayoi Kusama will be available for anyone to play at the Tokyo metropolitan government building. (Saki Rin)

A grand piano decorated by avant-garde artist Yayoi Kusama is now available for anyone to play on the 45th floor of the Tokyo metropolitan government's main building.

The yellow piano, peppered with black polka dots, Kusama’s signature motif, was unveiled April 3 at the No. 1 Building's South Observatory, located at 202 meters.

Up-and-coming pianist Tomoya Umeda put on a performance at the unveiling event.

Kusama, designated as an honorary Tokyo citizen, was asked by the metropolitan government to paint the “Tocho Omoide Piano” after a resident donated it.

Visitors are welcome to play the instrument regardless of their talent level, but are given a maximum of five minutes to show their stuff.

The hours to be set aside for the public to play have not been fixed yet.

The observatory, which offers panoramic views of the capital below, will reopen to the public April 8 after being closed for renovations.

There are two free-admission observatories, South and North, open from 9:30 a.m. to 11 p.m. Both are highly popular spots for foreign visitors, and welcome more than 2 million people yearly.

The metropolitan government was inspired to follow the example of overseas train stations and airports that installed pianos the public can freely play.