Was there not a move/tv show or some other source that i faintly recall where,
TEACHING SHAVING (DE or SR of course)
was by lathering a tomato and removing the lather with the blade. maybe i dreamed it?
Seems quite applicable as they have that continuous radius like a chin and you'll know if you nick it. There might be lather making lessons there too, but i think it's mostly about developing the light tough required by sharp razors.
if you cut the tomato, make a sammich.
then try again.
+++
as i was shaving just now, i recalled that i may have heard of the tomato "shave" thing from older men discussing how they were taught to handle a razor--but that it was years before i had enough fuzz to even understand.