Wendall Castle's 10 adopted Rules of thumb
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1. If you are in love with an idea you are no judge of its beauty or value.
2. It is difficult to see the whole picture when you are inside the frame.
3. After learning the tricks of the trade, don't think you know the trade.
4. We hear and apprehend what we already know.
5. The dog that stays on the porch will find no bone.
6. Never state a problem to yourself in the same terms it was brought to you.
7. If it's offbeat or surprising it's probably useful.
8. If you do not expect the unexpected, you will not find it.
9. Don't get too serious.
10. If you hit the bulls-eye everytime, the target is too close.
