Is there a way to override an instance method w/o subclassing?
For instance, class Morph has a method that returns true, but I want the that 
method to return false when instancing some types of Morphs and others not. 
(there is no setter/getter for this method.) Is there a way to do that w/o 
adding a setter/getter to Morph or subclassing the different Morphs?