If you look at objects from the behavioural point of view (and here we could say that each object is *written in its own language, for which the object is that language’s Interpreter*) the answer is “we don’t know how to build that yet, or even what that is”. quora 
In Logic, extensionality, or extensional Equality, refers to principles that judge objects to be equal if they have the same external properties. It stands in contrast to the concept of intensionality, which is concerned with whether the internal definitions of objects are the same. wikipedia
