I conceptualize it as a kind of "perfect fascism." Society is a megacorporation where everything is commoditized, everyone and everything is seen only in the value they provide to the corporation, and there are no considerations given to such quaint notions such as ethics, worker rights, or social responsibility; the only thing that matters is maximizing profit. Here profit is not any sort of monetary instrument, but a sort of energy that flows through all living things which creates reality; the consciousness of the universe, so to speak. The more of this energy that is accumulated, the more the forces of the universe can be bent to one's desires. The goal of the corporation is to create a monopoly on the universe and own everything. You could picture it as a fusion between JP Morgan Chase, Google, and Lockheed Martin, except on a much larger scale and above any sort of oversight, accountable to no one; an all encompassing panopticon. If the genocide of an entire species is considered to give the greatest overall long-term profits, it is considered morally good, if the ripple effects are too chaotic or considered to be more trouble than it is worth, then it is considered morally evil. The meaning of life is power. While there is a lot of coercion and manipulation that goes on within the hierarchy, everyone at some level subscribes to these core beliefs, which helps to maintain its cohesion.
Efficiency is one of the most important benchmarks for measuring the health of the corporation. A certain proportion of workers are needed for certain jobs. This is best accomplished by genetically engineering and cloning all children to be perfectly suited to their various tasks. This results in a rigid caste system based on the amount of mental energy one can channel at a given time, which is largely determined by the way the elite of the society had you manufactured. The labor caste consists of heavily augmented individuals who are little more than automatons. They do the drudge work, and they do it happily, because most of their freewill has been removed via various conditioning practices. The "middle class" caste manages the day to day operations of the corporation; they are given a few perks but are also heavily conditioned, and don't enjoy much outside of their jobs, where they are provided the bare minimum necessary to do them efficiently. They are on a treadmill to prove their value to the corporation and subtly reminded that they could be demoted in to the labor caste or worse if they don't conform. The professional caste is granted certain selected genetic upgrades and a larger allotment of energy that makes them racially superior to the first two castes. They are the first caste that has a significant amount of freewill retained which is useful for adapting to new situations and channeling the energy needed to quell dissent and expand the means of conquest. They believe in the mission statement of the corporation, and while they are manipulated, this belief is genuine and not externally reinforced. All of the fruits of the civilization flow to the ruling caste, of course, who is constantly looking for ways to augment it's psychic, physical, and technological prowess. They have complete access to the full knowledge of the civilization, and accumulate the majority of the energy harvested by the lower castes. They are like gods compared to the professional caste, and to challenge them is usually suicidal. They are like Transhumanists on steroids.
No one works for a wage in this society, but is instead given an allotment based on their caste and level of compliance. Your caste determines the amount and type of goods you can use, what type of accommodation you can have, and even what you're allowed to think about. Furthermore, in an effort to maximize efficiency, everything is standardized. For example, with the exception of the ruling caste, everyone in your caste would have the same house, same car, same furniture. You may be given some latitude to choose some superficial things, such as the scent of the air freshener in your car, or how to arrange your furniture that everyone else has, or whether you want blue draperies or red ones, but most of your discressionary decisions are made for you. The labor caste really has nothing, they are really just things, and are disposable. The middle caste is allowed certain minimal fruits of their labor, they are led to believe that their lives matter, but they are largely disposable as well. The ruling caste probably has palatial domains, some of which may even be superficially beautiful, filled with every kind of physical pleasure imaginable, twisted or not. The professional caste falls somewhere in between the ruling caste and the middle caste. If you are not compliant, they probably have some way of disconnecting you from the social memory complex and letting your psychic energy bleed out to the point that you become something of a husk.
4D societies are supposed to be composed of a network of minds, all psychically connected to each other with etheric roots in a common soul group. In theory, the thoughts and knowledge of one being should be available to every other being in that soul group, even in an STS society. In principle, I believe the rigid stratification of the members of that society due to conditioning, mind augmentation, and genetic modification of all kinds creates layers of society that are almost like separate species bound together by the intense mental energy emanating from the top of the hierarchy. Thus the ruling caste has created a level of superiority and complexity for themselves such that their notions and concepts occur on a level that is incomprehensible to the lower castes. Their psychic impressions can only be understood when given on a level that is simple enough for that particular caste, which provides a layer of secrecy. There is no such thing as privacy, since the higher castes can use their psychic abilities to see everything that is happening below them, making dissent a rarity. As a result, everyone is essentially the property of their boss, and the only curb on the amount of influence he is allowed to have over his subordinates is the limits of his personal interest in controlling them. There is very little upward mobility, the level of stratification that is built into such a totalitarian system ensures that one is pretty much resigned to whatever caste they were manufactured into. If the corporation is doing well with lots of new conquests, the wealth of one's caste may increase, but one's relative position will not. There are factions within the hierarchy which occasionally have power struggles, and it may be possible for one to rise to a higher caste by killing one's boss and taking his place. This is morally acceptable because if he was such a good controller, he would've been able to prevent the uprising. There is no place for weakness in the hierarchy, whoever is strongest at a given level is entitled to that position. Everyone dreams of being a ruler, because power is the meaning of everything, and being able to come up with more cunning and manipulative techniques for conquest can be beneficial for the corporation in the long run, but such internal discord can also make it vulnerable to rival corporations and is generally seen as bad for business.
As for art, I would say it is seen as idle distraction which diverts resources from the aim of society, which is conquest, and is banned unless it serves some kind of utilitarian purpose. So music for example would probably be some type hypnotic trance used as a form of mind control to keep workers entrained to their preassigned caste roles. They will be conditioned to like the music, which contours their minds to like their own slavery. I can see where the higher castes might have some sort of dark reiki or negative feng shui which somehow increases their resonance with negative archetypes and magnifies their own power through some kind of ritual experience. I think it would be very difficult for the dedicated STS being to enjoy something for the sake of enjoying it, they can only enjoy something in the context of it giving them more power over others.
This model should apply to the entire Orion Union, of which we are told the Lizzies are a part, with only relatively minor variations. It is a series of a nested hierarchies, which should follow the general template applied by the dominant race, which the Cassiopaeans refer to as Orion STS. Orion STS, being in an affiliated hierarchy that sits above the Lizzies, extracting energy from their ruling caste, is probably fantastically wealthy compared to the subjugated races. They may have the energy to afford "frills" on their planets, they may even be beautiful at first glance. I could see Orion STS being portrayed as the pinnacle of civilizational development after Earth transitions to 4D, but their exquisite existence is only possible through the enslavement of thousands of worlds.
Some evidence that supports my model comes from David Jacob's work, as well as a bit from William Bramley, Val Valerian, and of course the channeled materials. Basically there is evidence that some sort of control system is being imposed on Earth, and in a nod to Ant 22's remark about the Predator's Mind, if you take the most negative human control system that humans have designed and then develop it to its fullest potential, I think you get pretty a good idea of how the aliens function.