"All representation systems we use...are ultimately hermetic."

Every teacher, every administrator, every parent, every student needs to read Alan Kay's response to someone gushing over software that "teaches" children how scientists think, posted here at Tuttle SUV.

You can see the original exchange here.

I strongly urge you to spend some time looking through Tom Hoffman's other posts as well, though Tuttle SVC, like fine whiskey, may not be suitable for children.