Gladwell compares the actions of the adaptive unconscious to a locked door. The human mind is a complicated place, and most of its behaviors are difficult, if not impossible, to understand—in fact, the act of trying to interpret intuition often interferes with intuition itself. In this sense, the locked door symbolizes the mysterious, complicated nature of the mind, and the fact that attempting to understand it actually changes it.
The timeline below shows where the symbol The Locked Door appears in Blink. The colored dots and icons indicate which themes are associated with that appearance.
Chapter 2: The Locked Door
...being able to explain them. Put another way, snap judgments take place behind a “ locked door .” When people try to explain their snap judgments, the explanations are never very convincing.... (full context)
Chapter 4: Paul Van Riper’s Big Victory
Chapter 5: Kenna’s Dilemma