We travel to Ghana to meet El Anatsui and see the construction of his monumental installation for Tate Modern's Turbine Hall. Made of thousands of metal bottle tops and fragments, Behind the Red Moon builds on Anatsui’s interest in histories of encounter and the migration of goods and people during the transatlantic slave trade. Sourced in Nigeria, the liquor bottle tops used in this commission form part of a present-day industry built on colonial trade routes.