As part of Radio 3's 70th celebrations, Julian Barnes - also 70 this year - on why and how he alters his views. Today a word about vacillation, uncertainty and of course - memory.

"It sounds such a simple business.. 'I changed my mind.' Subject, verb, object - a clear, clean action..."

In five essays, the acclaimed author asks whether his point of view has changed over the years. Referring to historical characters and scenes from his own life, he first cites John Maynard Keynes and Francis Picabia. Then, what is the role of memory in all this?

Producer Duncan Minshull.