He gives the example of seeing your own shadow directly in front of the bike on the road. This happens to occur at just those times when you have excellent visibility ahead, and therefore feel especially relaxed. But the sight of your shadow should trigger an alarm: oncoming traffic or motorists waiting to cross in front of you likely cannot see you. It doesn’t feel dangerous; you have to have a theory about the situation, as it were. That is, to ride safely you have to actively summon a bit of knowledge that can be stated as a proposition, using language. Initially, this knowledge is abstract
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