The basic idea of unschooling is that we learn what we need by using it. And that's exactly how kids learn to speak English. Toddlers aren't trying to learn English. They're using a tool (English) to get what they want: which might be juice or a hug or picked up to see better. The English tool is more efficient than other tools they've been using: pointing or crying or wishing. And because English is more efficient, they use it more. And because they use it more, the get better at it. Kids learn English (and everything else) as a *side effect* of living and pursuing what they enjoy.
The theory of school is that someone can't be an engineer until they know everything an engineer needs to know.
But that's not now people learn best. Someone who loves to build things learns how to build things by doing what they love: building things! And since they love to build, they'll be fascinated by things that connect to building. They may be fascinated by history of building or artistic design in building or how structures built with different materials behave or the physics of balance and load distribution and so on and so on.
—Joyce Fetteroll
photo by Roya Dedeaux