Edgar Mueller

He spent five days, working 12 hours a day, to create the 250 square metre image of the crevasse, which, viewed from the correct angle, appears to be 3D.
He then persuaded passers-by to complete the illusion by pretending the gaping hole was real.

Ask about his work, he said: 'I wanted to play with positives and negatives to encourage people to think twice about everything they see. It was a very scary scene, but when people saw it they had great fun playing on it and pretending to fall into the earth. I like to think that later, when they returned home, they might reflect more on what a frightening scenario it was and say, "Wow, that was actually pretty scary".'