This is an exercise in understanding how perspective changes everything.
Equipment: nothing or maybe just a pen.
Instruct the participants to use their finger to draw an imaginary clockwise circle on the ceiling.
Tell them to move the circle down into their lap and then ask them to describe what they see!
The circle will be anti-clockwise. It's magic! They often say! No, it is the change of perspective.
Perspective matters
See Climate Change Playbook by Linda Booth-Sweeney and Dennis Meadows chapter 6 p 45
This book contains 22 games for systems discovery.
See also The Systems Thinking Playbook.