Switch things up!
The knob controls a paddle that directs the airflow either left or right.

You can use it to alternate between two different paths. Or, if you want to make things interesting, try building a loop with a single exit - it's a fun challenge flipping the switch back and forth until you get the ball through the exit. 

The winds of change are under your control with the Air Toobz Switch! 
Air Toobz Switch

Directional switch to add to your Air Toobz contraptions 
Encourages spatial reasoning, creativity, problem-solving, STEM learning
Turn the dial to direct the airflow either left or right
Includes one Switch accessory
All other Air Toobz components sold separately - Not included
Air Toobz fan unit sold separately - Not included