4/9 Brian Sewell on his love of 'Mad' King Ludwig II of Bavaria.
BBC Radio 4
3/9 Steven Pinker joins Matthew Parris to discuss the life of the philosopher Thomas Hobbes.
2/9 Ludwig Wittgenstein, fascinating and misunderstood thinker, is chosen by Raymond Tallis.
1/9 Michael Sheen champions Philip K Dick who has had an influence on his production of Hamlet