Francis Wyndham offered a more critical appraisal of the phenomenon of Dietrich in concert. He wrote in 1964: "What she does is neither difficult nor diverting, but the fact that she does it at all fills the onlookers with wonder ... It takes two to make a conjuring trick: the illusionist's sleight of hand and the stooge's desire to be deceived. To these necessary elements (her own technical competence and her audience's sentimentality) Marlene Dietrich adds a third—the mysterious force of her belief in her own magic. Those who find themselves unable to share this belief tend to blame themselves rather than her."