The 80 years old artist, Yoko Ono, one of the best known figures of 1960's Fluxus movement, opened her retrospective exhibition, To the Light, at London's Serpentine Gallery on Tuesday.

Yoko Ono is a pioneer of conceptual art. As the wife of famous John Lennon, she has been overshadowed until these five years. She has got a Golden Lion for lifetime achievement at Venice Biennale in 2009 and is being invited to "more and more shows in art galleries".

To the Light, includes her 10 years key installations, films and performances and her new works, such as works attempting to capture everyone's smile and trees on which you can hang your written wishes. Grapefruit (1964), Be Stepped On (1964), Cut Piece (1964) and the labyrinth titled Amaze are her other famous works.

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Ono's works in Serpentine has got high valuation from media. Ono's light touch "should not be mistaken for silliness", says Richard Dorment in The Daily Telegraph.

"Ono's tougher side provides the real highlight", though there is lots of Sixties peace and love, says Ben Luke in The Evening Standard.

When Ono was asked who her favorite artists are, she said "me" without hesitation.

The Fluxus movement' name was from a Latin word meaning "to flow". It valued simplicity and "do -it-yourself". They preferred to use materials at hand to create their own work or collaborate with their colleagues.