This is just the sort of I thing I was looking for - a
way to introduce 3-D when we come back from a week of
being off from the ice storms.
We don't use the "window" for transferring images -
too far to reach - we just use Ebony pencils to
scribble on the back of the drawing (or a separate
piece of newsprint) and use it like carbon paper.
And the other day a kids project "warped" and it
worried him and I told him it was "the nature of the
beast" and none of them had ever heard that saying, so
we say it all the time now. (I keep a stack of boards
for flattening stuff)