In the actor's first-ever public art exhibition, Brad Pitt has unveiled his sculptures in a lakeside art museum in Finland, the gallery said on Monday.

Located in Finland's third largest city of Tampere, this is the first time the "largely self-taught" American star presented his sculptures to the public, Sara Hilden Art Museum said.

"For Nick and I this is a new world and our first entry. It just feels right," Pitt told Finnish broadcaster Yle at the opening ceremony.

Pitt's work includes a moulded plaster panel "depicting a gunfight" and a series of house-shaped silicone sculptures that each have been shot with a different gauge of ammunition.

"To me it's about self-reflection. It's about where I have gotten it wrong in my relationships, where have I misstepped," Pitt said at the opening.

The 58-year-old actor's unexpected visit took the Nordic country by surprise as his involvement in the exhibition was not previously announced.

"In that sense this is exciting and wonderful," Chief Curator Sarianne Soikkonen told AFP.

The decision to include his friends Cave and Pitt in his exhibition was shaped by the pandemic and "events in Houseago's personal life", Soikkonen said.