Marree Man: The enduring mystery of a giant outback figure
This week marks 20 years since a helicopter pilot flying over central Australia spotted the outline of a giant man drawn into the earth.
Earlier this week, Australian entrepreneur Dick Smith offered a A$5,000 (£2,800; $3,700) reward for any information about the artwork's origins.
With an outline measuring a total of 28km, Marree Man had an initial depth of about 35cm (14 inches), according to local media reports.
Marree publican Phil Turner says he is convinced that its creator, or creators, were "professionals" who possibly used GPS technology.
"If you didn't have the co-ordinates, you would have no idea if you were standing in his left toe or his elbow. Considering GPS technology was in its infancy at the time, it is an absolutely remarkable feat."
Pilot Trevor Wright, the first to see Marree Man on 26 June 1998, says he spotted it by chance. But anonymous faxes were also sent to local businesses and media at the time, to inform them of Marree Man's existence.
