"Conceptual Mathematics"

Hello, I think the original motivation for "Conceptual Mathematics" was to introduce high school students to category theory. I am thinking of searching out high school student in my city to teach category theory. I have thought about this issue a lot and I suspect the students will have to be very sophisticated vis-a-vis mathematical concepts. I want to get anecdotal evidence/experience from this newsgroup on teaching high school students from "Conceptual Mathematics", i.e. category theory. Thank you in advance, Vasili [For admin and other information see: http://www.mta.ca/~cat-dist/ ]