From planting periwinkles on the graves of slaves, to the blues itself, the colour blue has been core to Black Americans’ pursuit of joy in the face of being dehumanized by slavery, argues Harvard professor Imani Perry. In her latest book, Black in Blues: How a Color Tells the Story of my People, she unpacks the deep, centuries-long connection between Black people and the colour blue, from the complex history of indigo dye to how the blues became a crowning achievement of Black American culture.