Invisible Art: Art about the Unseen, 1957-2012

Every summer the Hayward stages a gimmicky themed show to titillate audiences with immersive fun-filled experiences, but this year's offering is serious stuff, or described better, a serious lack of stuff. Most intriguing are the moments when you're left to negotiate embarrassing experiences of, well, not much, with others – either in the pitch-black room purporting to contain the ghost of an artist who died in 1997 or when faced with two humidifier units pumping out air that's been cooled with water used to wash bodies in a Mexican mortuary. (OW)