Principle 13. 'The other way round'

1. Invert the action(s) used to solve the problem (e.g. instead of cooling an object, heat it).
   To loosen stuck parts, cool the inner part instead of heating the outer part.
   Bring the mountain to Mohammed, instead of bringing Mohammed to the mountain.
2. Make movable parts (or the external environment) fixed, and fixed parts movable).
   Rotate the part instead of the tool.
   Moving sidewalk with standing people
   Treadmill (for walking or running in place)
3. Turn the object (or process) 'upside down'.
   Turn an assembly upside down to insert fasteners (especially screws).
   Empty grain from containers (ship or railroad) by inverting them.