We made slab boxes for a time capsule ( new millennium tie in), we then
filled the boxes with a handmade book, self portrait, and other stuff. Their
time capsule could represent them. Their future hopes, etc. Lesson on
symbols, etc.. Just a few ideas. I know that slip and scoring are difficult
to get across. I always show my students the pieces that I have fired that
the students did not use slip or score and they fell apart. The really try
hard after that. Good luck!