It has always been the outdoor disappearance of the climber, away from trees and structures, which has led to claims the illusion is "humanly impossible". McKeague's explanation not only solves the mystery of the mid-air disappearance but also provides an alternative explanation for the Wiseman-Lamont observation discussed above that eyewitness reports were more impressive when much time had elapsed. In the late 19th and early 20th centuries as the fame of the trick increased performers would have had increasing difficulty in puzzling audiences with it, until finally the disappearance of the climber ceased to be a feature and the rare witness who had seen it spoke of a time long before. This is because misdirection of attention is extremely unlikely to be effective when the audience is expecting the disappearance, a fact which also explains why no one could claim any reward for a performance where it was specified the disappearance must be included. The increasing fame of the rope trick and the basket trick ended the possibility of using "vanishing by misdirection" in the methodologies for both tricks.