The Brit singer Annie Lennox, known for powerhouse hits such as Sweet Dreams and Why, has made a mound dotted with ephemera and artefacts linked to different parts of her life. This very personal installation-cum-memento mori fills two galleries at MASS MoCA in Massachusetts (Now I Let You Go...., through Spring). Lennox, one half of The Eurythmics, has focused on the "flotsam and jetsam of what human beings are capable of creating", she says in an accompanying film. "Once we're gone, all that's left of the person are the objects we have interacted with." There are stories behind each of her chosen items; one part of the mound reflects the musical aspect of her life, another section highlights motherhood. "I think one of the human challenges is to come to terms in one way or another with our inherent state of impermanence and mortality," Lennox adds. Meanwhile, the musician, producer, fashion designer and all-round art devotee Pharrell Williams is collaborating with the Japanese artist Mr. on an exhibition at the Musée Guimet in Paris next month. The show—the latest in the museum’s Carte Blanche series, which invites contemporary artists to show new works—is due to run from 10 July to 9 September. "The immersive environment imagined by the duo will be populated with colourful childish figures, that have come from the imagination of Mr. and the creative world of Pharrell Williams," a museum statement says (that makes us Happy).