introduction
No system is a closed system. The framework of all systems is basically infinite. Any appearance of enclosure is the result of camouflage distortions, quite necessary within a given system so that the organisms within it can focus their main attentions to the problems within a particular system.

The outer senses
Since the outer senses or their equivalent are the main perceptors of camouflage constructions, then the outer senses and the physical apparatus or its equivalent will habitually perceive its particular system as a closed one.
The outer senses perceive only certain given distinctions within an open, infinite system, and these distinctions therefore become the apparent boundaries of the system. A closed system is, in other words, the result of the limitations of the outward senses, whose nature it is to distinguish as a meaningful reality only one portion of an open infinite system.
Perception
The distinctions formed by the outer senses therefore actually limit perception as a whole, while intensifying it into a small but vivid, seemingly enclosed radius of reality. When conceptual thought develops far enough, then it is imagined that all energy originates from what seems to be a closed system; and this misconception then colors all deductions made concerning the nature of energy itself.
I repeat that no system, either microscopic or cosmic in size, is ever a closed system. No closed system exists. I will not at this time discuss the deeper issue of one infinite and open system, although this is reality which has indeed theoretically no limitations. Energy completely and constantly does renew itself.

An analogy
This may be a poor analogy. However, imagine a small room, a very small room, into which a light Ping-Pong ball has been flung with great force so that it bounces back and forth against the narrow walls. From within the room inhabitants watching would be able, through mathematical deductions, to deduce exactly how long the ball would keep its continuous bouncing activities, at what rate the motion of the ball would lessen, and at what future time the motion would cease entirely.
This would represent a closed system. The calculations would have to be based upon the supposition that the original system somehow had its origin within the room itself. Imagine now that our inhabitants have been hypnotized into believing that they are in a small closed room. Their attention is completely focused within the imaginary room, with the result that all their concepts are based upon that belief.
Summarizing
This is the case as far as the idea of a closed system is concerned. All so-called closed systems are caused by a limiting of perception, a narrowing down of distinction, a subconscious agreement that the props are real, and that boundaries exist. Conversely, the boundaries do exist when they are thought to exist.
A cell is not a closed system. An egg, despite all appearances is not a closed system. A skull is not a closed system.
TES2 Session 78 August 10, 1964
Short Summary
In this excerpt, Seth challenges the concept of closed systems and argues that no system, whether microscopic or cosmic in size, is truly closed. The limitations of our outer senses lead us to perceive certain boundaries within an open, infinite system, creating the illusion of enclosure. The author emphasizes that energy constantly renews itself and that no system is isolated. The analogy of a small room with a bouncing ball is used to illustrate the misconception of closed systems. The belief in closed systems arises from a narrowing of perception and a subconscious agreement on the existence of boundaries.
Key takeaways
1. No system, regardless of its size, is truly closed.
2. The limitations of our outer senses create the perception of enclosure and boundaries within an open, infinite system.
3. Energy constantly renews itself and is not limited to any closed system.
4. The analogy of a bouncing ball in a small room demonstrates the misconception of closed systems.
5. Belief in closed systems arises from a narrowing of perception and a subconscious agreement on the existence of boundaries.