Barbara Oakley talks about this in her talk at Google, "Learning How to Learn".
https://www.youtube.com/watch?v=vd2dtkMINIw&feature=youtu.be...
She says Edison did the same thing too, but had a handful of ball bearings instead of a key.
https://www.youtube.com/watch?v=vd2dtkMINIw&feature=youtu.be...
She says Edison did the same thing too, but had a handful of ball bearings instead of a key.
Do it!