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Or you could make a series out of this.

DE closed comb then open comb.

SE continued.

Then straights 5/8 6/8 7/8 etc,

Sounds like it would be a good fit for a reality...

My vision of teaching with a balloon would be the balloon popping and the student jumping and flinging the razor or cutting themselves!

Show them not to be afraid and trust themselves and their abilities.

Many think when they see how sharp a razor can be "I don't trust myself to look at myself in a mirror and use such a tool!"