Wonderful World Of Pixels
Coming from a purely art teaching background, I used to tell students that when you draw things sometimes looking at the big picture will frustrate you. I told them to think simple, to trick the critical part of yourself by focusing on the small stuff. Don't think lips, think shape. Don't think eye, think line. Don't think color, think value.
In order to introduce pixels to my digital photography students I used a lesson my art students loved. The gist of the lesson is to introduce the way pixels by themselves don't show the whole picture. But when you put hundreds of pixels together with a range of values or tones you start to see a complete image.
This lesson can be applied to any subject. With this lesson you can add a bit of drawing to whatever topic your working on with your class.