He uses a "transparency in my animations" filter
( Michael Ellis In other words "Art thief still keep cartoonist", Wed 1 Feb 2012, 14:57, archived)

let "FORGIVE" = "NEVER"
( barryheadwound Mul-ti-pass? Multipass!, Wed 1 Feb 2012, 14:59, archived)

Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha Ha
( Wobbly Bloke Hello, did I miss anything on, Wed 1 Feb 2012, 18:00, archived)