4 ms·

How about waving your arm once to turn on a light switch and then wave it again to turn it off?

• vidanay 4y ago
  Kind of like moving a wall switch up once, and then down once?
  • Urd- 4y ago
    Yes that was the idea. :)
• bryanrasmussen 4y ago
  then you are back to having a light switch that you might absentmindedly forget to turn off costing money.