- move square, with obstacle, with a few of them, with a few an only
   some bring rewards.

 - can move an object only indirectly (i.e. reward when blue square
   reach a certain location, but penalty if blue square is touched)

 - copy an arrangements of objects on the other side of the world

 - move an arrangement of objects in the same order

 - avoid moving objects

 - reward if an object touch another one of a specified shape or
   color, whatever its location