Sean Lennon

In truth, Yoko Ono has a vast and somewhat unnerving back-catalogue. Some of it ("Cut Piece") demonstrates real genius, while other pieces (many of the arty statements she makes on Twitter, for example) can feel a tad trite and vacuous. But in the presence of the work itself, much of it performance art that can only be experienced in the moment, one feels somewhat overwhelmed.
The life of Yoko Ono, who turns 80 today, can be divided into four distinct parts, each of which regarded separately would