Marta saved the quote from a post on Always Learning.
Here's something similar:
SandraDodd.com/being/with
photo by Karen James, a few years ago,
in a giant wheel in Japan
"The idea of unguided discovery in a school setting isn't anything like the kind of discoveries unschooling kids make. There is a difference between a teacher handing a kid a pulley and telling him to discover what it does and write a paper about it and a kid finding an interesting object and messing with it because it sparked his curiosity. A lot of what my son has learned he's learned in a way that might be called unguided discovery, but it didn't look much like the model in the article, and it didn't happen in a vacuum."