Halo Effect: difference between illusion and delusion

This is a part of quotes and thoughts that attracted my attention, while reading the “The Halo Effect …and the Eight Other Business Delusions that Deceive Managers” by Phil Rosenzweig.

Preface, p. xxi:

A longtime friend of mine, Dick Stull, explains the difference between illusion and delusion this way. When Michael Jordan appears to hang motionless in midair for a split second while on his way to a slam-dunk, that’s an illusion. Your eyes are playing tricks on you. But if you think you can lace up a pair of Nikes, grab a basketball, and be like Mike, well, that’s a delusion. You are kidding yourself. It ain’t gonna happen. The delusions I describe in this book are a bit like that – they’re promises that you can achieve great success if you just do one thing or another, but they’re fundamentally flawed. In fact, some of the biggest business blockbusters of recent years contain not one or two, but several delusions. For all their claims of scientific rigor, for all their lengthy descriptions of apparently solid and careful research, they operate mainly at the level of storytelling. They offer tales of inspiration that we find comforting and satisfying, but they’re based on shaky thinking. They’re deluded.

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