(Those of you who wanted to see examples of what i was talking about in class... continue reading. :)
Here's a photo of me by a star student... you can see i'm interrupting the pattern of the brick pillars and the pattern of the horizontal brick.
Next that you can see the photo i mentioned in class... the one short thermos breaks the pattern of both height and color. Your eye goes to that, then to the red lid on the top left. If all the lids had been red, it might have stood out more from the white wall... but overall, well done image. :) I like it a lot.