Whew! At this point, the book has covered a lot of ground and you have come a long way in a very short time. Now we’ll ease the pace just a bit and address some nuances of ZigBee mesh networking, including sleep mode, end devices, and power management. Then it’s time to change things in the world with direct actuation. This chapter features a powerful control project you could use to automate your home or to play Pong using the window lights in a skyscraper.