ay Harryhausen, often regarded as the father of the visual-effects spectacle, has died in London at age 92. In a day when the work of visual-effects artists is often credited to hundreds of technical wizards, Harryhausen is remembered as an artist who worked alone or with a small crew but who also consulted with the screenwriters and directors on effects concepts with such films as Jason and the Argonauts and the original Clash of the Titans. At the 1992 Academy Award ceremonies, where he was honored with a special Oscar, Tom Hanks, who presented it to him, remarked, Some say Citizen Kane is the greatest motion picture of all time, others say it's Casablanca. ... For me, the greatest picture of all time is Jason and the Argonauts.