Any model is still within created constraints

Nothing can be truly explained in terms of a block diagram model. There are tons of layers and these layers are connected too. They may have symbiotic relationships, different types of dependencies and also circular, iterative and probabilistic relationships. Once we move to the metaphorical level, each thing can be not only be connected to everything else but also in myriad ways. I strongly believe each thing is connected to everything else at a higher level (like the concept in avatar movie). A mega chain of relationships may even connect something as remote as beavers in central america and  the quality of tea in japan or something like that. Each thing is inseparable from everything else, almost like a hologram or a fractal.

It seems that, the only way to construct any kinds of abstractions in reality such as block diagrams is to impose artificial constraints. The limits could be on boundaries and complexity of relationships.

For example:

• The stretch of imagination required to relate 2 fields should not be too much(subjective constraint depending upon audience)
• Metaphorical relationships are to be kept minimum(subjective constraint, in truth metaphors are equally valid)
• The chains should not be longer than 20 arrows across(to limit complexity and scope)

Everything is constrained whether, its anything I do in a job, the way a house is built, any kind of design etc. Along with nature's rules human beings too have a ton of artificial rules. Its a complex dynamic system among humans and I think the primary reason for conformity and rule creation is to create 'sameness' in society. People cannot work together if they do not want the same things. Language itself, the most powerful tool in our communication, is inherently constrained. When I say I'm happy, its an abstract concept and there could be tons of feelings grouped under this category.