Yoko Ono at London's Serpentine: 'I was helped by the angels' - in pictures

'I created Ceiling Painting [which] one had to climb the ladder to see. The painting said "Yes". I think I was helped by the angels' Photograph: Yoko Ono

'What a beautiful green I am surrounded with. I want to remember this. Where do I go from here?' Photograph: Yoko Ono

'My work A Blue Room Event was made to enlarge my small, one-room apartment downtown' Photograph: Yoko Ono

'Here I am checking what I should do with my newest work called Wall' Photograph: Yoko Ono

'Talking to the curatorial/installation team about the show' Photograph: Yoko Ono

'Measuring the height of my helmet works' Photograph: Yoko Ono

'I feel very Japanese here, looking at a tokonoma-like alcove space' Photograph: Yoko Ono

'We had to go through many serious faces. At last, we are smiling!' Photograph: Yoko Ono