I'm still working on this lesson myself as I haven't gotten the kind of
results I would like from my ninth graders. Previously I used wet blocks (stored in
zip locks) and we used small paring knives to carve. I think one problem for
me with only using knives on wet plaster is that too many kids got into
cutting small details and not really developing their form. We went abstract.
My director has helped me refine this lesson by adding riflers to the
process. Actually she does it with a dry block using only riflers.
Next year I think I will still use the knives but will try to add riflers to
the process after the plaster is dried so you can do more carving/cutting by