He produced three books of black-and-white illustrations, and prints of these works, overseen by Ono, have been offered for sale in Britain and America. However, some have been coloured in, issued as limited edition prints and stamped with Lennon's special insignia. In some cases, it is claimed extra characters may have been added.
Gary Arseneau, a Florida-based artist and creator of original lithographs who has investigated the sales, claims that the works should not be sold under Lennon's name. "This is work that John Lennon has never seen, never created, never approved, and never signed. The dead don't create artwork," Times Online quoted him as saying.
Ono, however, strongly denies that her late husband's work has in any way been misrepresented. She admitted that colour was added to some of Lennon's drawings after his death, but buyers of the limited edition prints are told of any changes.