Evidence for this process comes through the story of the vanishing elephant. In a series of experiments, researchers exposed participants to one of two versions of the tale. Half read a version that amped up the element of mystery – the fact that other illusionists have struggled to work out how the trick worked. These participants were then asked to describe how they thought Houdini had hidden Jennie. Whatever their answer, they were told that they were “close but not completely right”, which left a gap in their knowledge, creating further uncertainty and intrigue.