London gallery displays recycled human waste

Three rooms of London's Lisson Gallery are currently home to 21 blocks of recycled human waste.&nbsp I walk in between them, passing my fingers over the surface of one, round the corner of another. They don't smell, crumble or smudge.They are not distasteful to the eyes. They are large as doors and, having travelled here from Delhi, look hardwearing. A lick of paint and they could be your bedroom door, your kitchen table.