Opef is a medium which filters effects and reactions. It allows people to express and realise some consequences which 3 dimentional states of mind might generate...
  1. Yes
  2. No
  3. MyWay

In classical Western tragedies, the main character always has a choice whether or not to take an action which will lead to its inevitable tragic consequences.
That main character also knows that their actions will lead to a bitter end - but they act regardless.

For example: 
You can download it (38k) if you wish to express with it -
or try this