On 1 March 2009 a flash mob, organised through Facebook, paid tribute to Hart with around two hundred Morph figures displayed outside the Tate Modern art gallery. Hart's daughter, Carolyn Ross, attended and judged the "Best Morph in Show".
A memorial plaque is displayed in Hart's birthplace, the town of Maidstone, where he studied art at the town's art college. The plaque was unveiled by his daughter in May 2009 at the Hazlitt Arts Centre.