The first of these is the impasse: before there can be a breakthrough, there has to be a mental block. Wag Dodge spent minutes running from the fire, although he was convinced that doing so was futile. Then, when the insight arrived, Dodge immediately realized that the problem was solved. This is another key feature of insight: the feeling of certainty that accompanies the idea. Dodge didn't have time to think about whether his plan would work. He simply knew that it would.