Subject: Why does a fan turning one direction cause another fan to spin opposite?

I was wondering what made the blades on the small fan turn in a 
different direction than the blades on the ceiling fan.  I have a 
small Christmas decoration that is a fan powered by candles.  
When you burn the candles, the blades of the fan turn. This fan 
was placed on a table, underneath our ceiling fan.  When we 
turned the ceiling fan on, the blades of the small fan on the 
table began to spin.  They were turning in the opposite direction 
of the blades on the ceiling fan.

Re: Why does a fan turning one direction cause another fan to spin opposite?