Movement! You gotta love it! (Pamela Cruz)

 Movement is a principle of design that gives an image or illustration life. It also has a certain flow to it that makes it look nice. You can also define it like this, courtesy of Dictionary.com : [an] abundance of events or incidents

It's pretty much the best principle out there because it makes your images interesting. You know ANYONE who likes to look up or see pictures of lame, non-moving fruits in a bowl no matter how classic? Yeah, I didn't think so either. Sure, you still need your Balance and Emphasis and all, but I'm telling you, this is what makes people stare at their computer or mobile phone screen for hours on end as they stare in sheer ecstasy your work. When you add the illusion of movement or include several events in a photo that make it flow from left to right or top to bottom or whatever to whichever, you'll get admiration from many people. The following images show this off perfectly.

This principle also can make you feel like you can imagine the image moving or it may even look like it really is moving.

Oh, and if you want to see where the pictures came from, visit these sources. 

http://www.flickr.com/photos/47030960@N04/4425408182/

http://www.designtutorials.info/movement-effect/

http://www.shuttershock.com/pic-2324970/stock-photo-zooming-out-on-out-of-focus-christmas-lights-to-give-it-a-feeling-of-movement-and-motion.html

Not sure why since you can just copy and paste these photos or hit the "Save as" button, but then again, LEGALITIES. They're always on our backs....