Glass wall F
An almost invisible mirrored tree house (built in Sweden in 2010), which makes itself nearly invisible by reflecting the surroundings about it, the future technology-laden home, inside of which, remains completely hidden to outside observers. The invisible mirrored treehouse is a good semi-representative depiction of a human thermodynamics glass wall (the glass walls of human thermodynamics, however, conceptualized as being free-standing door-way-like invisible glass walls located in various unseen spots in vast fields of greenery. [1]
In human thermodynamics, a glass wall is a term used to describe the barriers to solution one runs into in attempts to apply the universal laws of thermodynamics to the nature of the processes, mechanisms, and reactions of the human condition.

This idea of glass walls is explained well by Romanian mathematician Nicholas Georgescu, in his famous 1971 book The Entropy Law, in which he attempts to outline the application of the governance of the second law to the economic process: [1]

“The fact that a natural law is involved in every aspect of man’s behavior is so common that we would not expect the study of the influence of the entropy law on man’s economic actions to present any unusually complications. Yet manifold avenues open up almost as soon as one begins to tackle the problem.”

Georgescu’s mention here of “manifold avenues” opening up, is an underestimate to the number of conceptual problems that arise in applying thermodynamics, particularly chemical thermodynamics to the explication of human activity. Georgescu was a mathematician, untrained in thermodynamics, who became slowed by the increasing density of the problem when he began to see manifold avenues, which acted to halt his solution seed, in that he did not immediately know which avenue to follow. When one is trained, fundamentally, in thermodynamics, the thickening of the density of the problem increases.

Visualization
The visualization of this term is such the nature of the attack of attempt to formulate any of the various branches in human thermodynamics will follow a certain sequence:

(a) One will come across the subject of thermodynamics, in their studies.
(b) One will come to the understanding that thermodynamics governs all natural processes.
(c) One will come to the understanding that human activity is a natural process.
(d) One will have some question on his or her mind, regarding human existence, and grasp on to the vision that thermodynamics will give solution to this question.
(e) One will apply the framework of thermodynamics on to the question; often times, in a sense, “running” towards what he or she sees as the solution or finish line, with the zest of a euphoric child.
(f) One will run into an invisible “glass wall” of conceptual difficulty that he or she did not see in the original viewpoint, which will act to bring the running to a complete halt, as if a speeding mime ran into an imaginary glass wall.
(g) One will begin to pry on the glass wall, to find a working model either around or through the glass wall, so as to continue on with the running to the finish line.
(h) One will run into a second glass wall.
(i) One will repeat the process of part (g).

Human chemical bond
On the largest glass walls in human thermodynamics is the arrival upon the subject of the human chemical bond. In simple term, the logic of chemical thermodynamics states that society (a thermodynamic system) is comprised of various progressively reacting human molecules. The set of these reactions, on their approach to equilibrium points, must actuate to show a decrease in Gibbs free energy, signified by the spontaneity criterion; which will consist of free energy coupled reactions (some being exergonic, others being endergonic, the sum of these being exergonic). The study of one single exergonic reaction, will consist typically of "single" unattached reactants in the initial state and "bonded" products in the final state in a combination reaction:

A + B → AB

In this scheme, the bonded product can either be written as AB, signifying an attachment of two chemical species, or C, meaning C equates to AB, signifying that a new molecule has formed. The study of physics and chemistry of the AB attachment, in terms of what fundamental forces of the universe act to hold this pairing together, is a subject never before tackled or even conceived of as a subject; that is until one sees it as a needed subject in the description of the energy state of the products, before further progress can be made in the formulation of human thermodynamics. The startled researcher who first arrives at this "glass wall" problem, will be come to a complete halt in their solution process, curious as to significance and previously unknown awareness of this problem (subject of study). It takes nearly three years of hard science prying on this puzzle to even begin to see around the glass wall, let alone get past the wall.

Life
One significant glass wall in human thermodynamics is the question of applying cold hard and precise chemical thermodynamic logic to the question of the origin of life viewed in particular from the human molecule/molecular evolution table/evolution timeline perspective. It takes roughly six years to go through this problem before the solution is seen (see: defunct theory of life).

References
1. Georgescu-Roegen, Nicholas. (1971). The Entropy Law and the Economic Process (pg. 3). Harvard University Press.
2. Alter, Lloyd. (2010). “Almost Invisible Mirrored Tree House Build in Sweden”, Yahoo Green, Jul 21.

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