In 1991, self-professed pranksters Doug Bower and Dave Chorley made headlines claiming it was they who started the phenomenon in 1978 with the use of simple tools consisting of a plank of wood, rope, and a baseball cap fitted with a loop of wire to help them walk in a straight line. To prove their case they made a circle in front of journalists; a "cereologist" (advocate of paranormal explanations of crop circles), Pat Delgado, examined the circle and declared it authentic before it was revealed that it was a hoax. Inspired by Australian crop circle accounts from 1966, Doug and Dave claimed to be responsible for all circles made prior to 1987, and for more than 200 crop circles in 1978–1991 (which other 1000 circles not being made by them). After their announcement, the two men demonstrated making a crop circle. According to Professor Richard Taylor, "the pictographs they created inspired a second wave of crop artists. Far from fizzling out, crop circles have evolved into an international phenomenon, with hundreds of sophisticated pictographs now appearing annually around the globe."