Visual Literacy

"Now, you shouldn't ever sit on top of a ladder. That's dangerous."

"But Daddy, there's a picture of somebody sitting on top of the ladder!"

"Ah yes. Do you see that little circle with a  line through it? That means that you shouldn't do it."

"Oh. Okay. But it's not dangerous. It's just that you could get really hurt."

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So what other elements of visual literacy do we take for granted?