The greatest value of a picture is when it forces us to notice what we never expected to see.

If we are going to make a mark (key 21), it might as well be a meaningful one.

I know of no person or group that is taking nearly adequate advantage of the graphical potentialities of the computer.

Be approximately right rather than exactly wrong.

Numerical quantities focus on expected values, graphical summaries on unexpected values.

All we know about the world teaches us that the effects of A and B are always different-in some decimal place-for any A and B. Thus asking "are the effects different?" is foolish.

In a single sentence the moral is: admit that complexity always increases, first from the model you fit to the data, thence to the model you use to think about and plan about the experiment and its analysis, and thence to the true situation.