The whole post is a great analogy about a train ride (schooling) vs. a car ride (homeschooling) vs. family and individual bike trips (unschooling).
So the next time someone asks you if you are afraid your child will have knowledge gaps because of unschooling, you can say something like, “I’m sure they will! And what thrilling opportunities those gaps will provide for my child!”
The next time you are feeling doubts about unschooling, when you question whether or not your child is learning everything he or she needs to know, you can think of bicycles. You can think of all the interesting gaps your child has crossed so far on a bicycle. And you can get excited about the possibilities of where and when your child will find the next gap, and how you can support him or her in crossing it.