I find that using the example of video game playing helps students understand the technique. To not look at your hand while you draw is the same thing gamers do when they play.
When I was in high school, I had a very hard time achieving a likeness without a grid or tracing. My drawings looked human, but not like the person I was trying to draw. When I learned about blind drawing, I immediately saw a "likeness" in the abstracted lines. There's a Zen-like experience as you become "one with the line."
Over time my own work went from vaguely similar to my subject to people mistaking my work for photographs like the portrait below.











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