?? English instruction:
The Vortex Cannon makes beautiful smoke-rings that drift through the entire hall.
• What do you feel, when you stand right in front of the ‘Cannon’?
• Observe the smoke-rings drifting through the air. Is their shape and speed always the same?
• What happens, when a quarter of the opening of the Vortex Cannon is closed, what happens, when it is half closed?