Does a curveball really curve? or is it just an illusion

I was just curious because I do actually watch and play baseball, does a curveball actually curve or is it just an illusion of our depth perception.
 
It really does curve!

Because the ball is spinning, the pressure on one side is greater than the other, so it is pushed to the side. For the nitty gritty details, google "Magnus effect".
 

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