Here is the custom switch and the story behind it. (Skip to :32 to just watch the switch video.)
Thanks for watching and feel free to ask any questions!
As I mentioned in class last night, you’ve done a good job of matching the interaction (the light coming on) with the natural physical action (using the knife). What other signifiers are there that the knife is “active”? What else could you use to notify people that it’s in use?