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We are drawn to wildness and disorder, argues historian Bettany Hughes. She tells Andrew Marr about the attraction of Bacchus, the god of wine and fertility, and the subject of a new BBC Four documentary. Bacchus (also known as Dionysus) has been a symbol of excess ever since Roman maidens fled to the woods and drank wine in his name. Hughes follows the Bacchic cult through history, and argues that chaos has been as important to civilisation as reason and restraint.The wood - scene of so many Bacchic revelries - comes to life in nature writer John Lewis-Stempel's new account, The Wood: The Life and Times of Cockshutt Wood. Through poetry, folklore and his own observations he asks what it is that draws us to magical spaces.Today we revel in feelings of joy and wonder, but feelings themselves are a surprisingly modern invention, says cultural historian Rachel Hewitt. She looks back at the 1790s, the decade when men and women of learning first began to take emotions seriously. Hewitt explains how an Enlightenment interest in reason led us to explore our own chaotic moods.There are Bacchic scenes in the music of Debussy, as biographer Stephen Walsh shows in a new study of the French composer. Away from his piano Debussy had to battle professional vendettas, but in pieces such as Prelude to the Afternoon of a Faun, Debussy created a world of rich woodland scenes and musical intoxication.Producer: Hannah Sander.

At the Free Thinking Festival at Sage Gateshead Lionel Shriver discusses her new collection of short stories Property with presenter Kirsty Wark.While Lionel Shriver explores our relationship with objects and places, and asks what the increasing accumulation of things may be doing to the soul, the sociologist Bev Skeggs explores how we are being bought and sold in the digital sphere. She also counts the cost of the monetisation of human relations and highlights communities in the North of England who are bucking this trend.The economist Linda Yueh looks back to the thinkers of the past from Adam Smith to Milton Friedman, to show the importance of understanding the ideas that underpin the world of finance. And the poet Sean O'Brien armed with 'paper and a clock' explores the history of Europe in his latest collection and argues that Great Britain's future will be shaped by what we remember and what we forget of our shared past.Producer: Katy Hickman.

What is art - and why do we need it? Fifty years ago the landmark BBC Two series Civilisation set out to answer this question. Now historians Mary Beard, Simon Schama and David Olusoga take on this challenge of defining human civilisation through art, in a bold update renamed Civilisations. Mary Beard tells Andrew Marr how humans have chosen to depict themselves, from enormous pre-historic heads in Mexico to lustful paintings meant for male eyes. She unpicks the bloody battle between religion and art, and declares that "one man's art is another's barbarity".But should art make us recoil? Simon Schama explores our urge to destroy the images we dislike, and finds that hatred and destruction have followed art through the centuries. This clash of religions and cultures has enriched art, argues David Olusoga. He sees culture on the frontline as empires expanded and a battle took place to define what art could be.This spring the artist Tacita Dean offers her own account of art's value and meaning as she unveils three exhibitions at once: exploring landscapes at the Royal Academy, portraits at the National Portrait Gallery and still life at the National Gallery. Moving between film and painted images, she challenges our idea of what art looks like.Producer: Hannah Sander.