Three to see: London

Found (until 4 September) at the Foundling Museum is a treasure trove of, as the title suggests, (mostly) found objects. Curated by the artist Cornelia Parker, the show brings together pieces belonging to, or works made by, artists such as Jeremy Deller, Laure Prouvost, Rachel Whiteread and Wolfgang Tillmans. Look out for Gavin Turk’s grotty-looking bronze sleeping bag installed beneath a Hogarth painting and the pop star Jarvis Cocker’s strange collection of Ceaușescu-era Romanian magazines, which he found in a bin bag.

The strange swirling, near-abstract, watercolors by the Victorian artist Georgiana Houghton at the Courtauld Gallery (until 11 September) are made all the more haunting by her story. A Spiritualist medium, Houghton claimed that her hand was guided by artists of the past such as Titian, as well as by angels. Her interest in the afterlife became particular pronounced after she began attending séances in her 40s, having lost four of her nine siblings.

Mona Hatoum’s first major UK survey closes next weekend (21 August) at Tate Modern. The work of the Beirut-born Palestinian artist, who moved to England in the 1970s, is heavily influences by her Middle Eastern upbringing mixing the poetry of the Arabic language and script with themes of violence and incarceration. 

Three other must-see shows: Ragnar Kjartansson at the Barbican; William Eggleston at the National Portrait Gallery; Georgia O’Keeffe at Tate Modern.