But when attention is focused on the view during a walk, part of the brain is left free to pursue associations that normally are not made. This mental activity takes place backstage, so to speak; we become aware of it only occasionally. Because these thoughts are not in the center of attention, they are left to develop on their own. There is no need to direct them, to criticize them prematurely, to make them do hard work. And of course it is just this freedom and playfulness that makes it possible for leisurely thinking to come up with original formulations and solutions. For as soon as we get
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