Mental Blocks to Creativity
Illustration
by Roger von Oech

Mental blocks to creativity:

  1. The right answer
  2. That's not logical
  3. Follow the rules
  4. Be practical
  5. Avoid ambiguity
  6. To err is wrong
  7. Play is frivolous
  8. That's not my area
  9. Don't be foolish
  10. I'm not creative

Above all beware of No. 1. It stops most all creativity. 

A Whack on the Side of the Head, by Roger von Oech