> Put my hand through one in the store.

Sure - but the impeller (hidden in the base) is still based on rotating 
mechanical objects. Or am I wrong here? Did I miss something? If so - my 
apologies.

I see small difference (in priciple) between it and a fan. Nothing really 
new, apart from the ring-geometry used to amplify airflow.

And I really doubt that the impeller is more easy to clean than a 
conventional fan. What if enough dust is sucked inside the impeller? >Can< 
you even clean it?

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