Observations: Lennon's smile travels north

They say if you smile the world smiles with you. Perhaps that's what Yoko Ono will be hoping when she projects her 1968 Film No 5 (Smile), a film of John Lennon's smile that evolves over 51 minutes, on to some of Newcastle's most famous landmarks as part of her new exhibition at the Baltic Centre for Contemporary Art.

'Between the Sky and My Head', which opens on Sunday, is one of the largest exhibitions of Ono's work to date and comprises pieces from the Fifties to the present day.

As well as sculpture, paintings, drawing, photography, films and sound installations by the woman John Lennon once described as "the world's most famous unknown artist: everybody knows her name but nobody knows what she does", there's plenty to see outside the exhibition.

After an artist's talk to open the show, Ono will invite the audience to send and receive "I love you" messages with small flashlights to and from the town's Castle Keep. There will be wish trees, where visitors can write their wishes on paper and hang them from the branches, a huge Imagine Peace banner hanging from the gallery building and a participatory piece named My Mommy is Beautiful, for which people will be invited to bring along photographs and memories of their mothers. The photographs and memories will be permanently attached to blank canvases and sent to Ono in New York when the exhibition ends next March.

www.balticmill.com/yokoono