Have you ever sat in a coffee shop, watching the steam rise from your mug, and realized that you are essentially a walking, breathing, complicated chemical reaction?
It sounds a bit heavy for a Tuesday morning, I know. But there’s a reason why scientists, engineers, and even business strategists obsess over the concept of open and closed systems. Everything in our universe—from the tiny cells in your body to the massive galaxies swirling above us—operates within these boundaries.
If you don't understand which category your project, your business, or even your own habits fall into, you're basically flying blind. You'll keep trying to fix problems using tools that were never meant for the job.
What Is an Open or Closed System
When we talk about systems, we aren't just talking about computer software or a closed-door meeting. Day to day, in the broadest sense, a system is just a collection of parts that work together to do something. The "open" or "closed" part refers to how that collection interacts with the world around it That's the part that actually makes a difference..
Think of it as a boundary. Is that boundary a sieve, or is it a brick wall?
The Open System
An open system is a setup that constantly trades stuff with its environment. An open system doesn't exist in a vacuum. That "stuff" can be anything: energy, matter, information, or even people. Worth adding: it breathes. It takes things in, processes them, and spits something else out Easy to understand, harder to ignore..
Take a plant, for example. Worth adding: it’s a classic open system. It takes in sunlight (energy), water (matter), and carbon dioxide (matter). It processes these through photosynthesis and releases oxygen and glucose. If you put a plant in a sealed, dark box with no air, it dies. It needs that exchange to survive.
The Closed System
Now, a closed system is a bit more hermit-like. In a truly closed system, energy can move in and out, but matter cannot. It’s a bit of a theoretical middle ground that's hard to find in the wild, but it's incredibly useful for understanding how things work It's one of those things that adds up..
Imagine a sealed glass jar with a small plant inside and a lightbulb shining on it. The light (energy) can get in, and the heat can get out. But the dirt, the water, and the air stay trapped inside that glass. The system is "closed" to matter That's the part that actually makes a difference..
The Isolated System
Here is where people often get tripped up. There is actually a third type: the isolated system. This is the extreme version. Think about it: an isolated system trades neither matter nor energy with its surroundings. In the real world, a perfect isolated system is almost impossible to achieve, but a thermos is a decent attempt. It tries to keep the heat (energy) in and the coffee (matter) in That's the part that actually makes a difference..
It sounds simple, but the gap is usually here.
Why It Matters / Why People Care
Why should you care about these distinctions? Because most of the friction we experience in life comes from treating an open system like it’s a closed one.
In business, if you treat your company like a closed system, you’re asking for trouble. Day to day, you might think, "We have our own internal processes, our own culture, and our own way of doing things; we don't need to listen to the market. " But the market is the environment. The market is the energy and matter flowing into your system. If you plug those holes, your business eventually starves Less friction, more output..
In biology, understanding these systems is the difference between life and death. Your body is a masterclass in open system management. Still, you eat, you breathe, you sweat, you radiate heat. If your body suddenly became a closed system, you'd be a statue.
Even in physics and thermodynamics, these concepts dictate how we build engines, how we predict weather, and how we understand the eventual fate of the universe. If you can identify the boundaries of your system, you can predict its behavior. That’s the real superpower here That's the part that actually makes a difference..
How It Works
To really get a handle on this, we need to look at the mechanics of how these boundaries function. It isn't just about "in and out"; it's about the flow and the entropy.
The Flow of Matter and Energy
In an open system, the flow is continuous. This is what allows for growth and complexity. Because an open system can pull in new resources, it can increase its internal organization. This is how a small startup becomes a global corporation—it pulls in capital, talent, and data.
In a closed system, things are more static. Also, because you can't add new matter, you are limited to what you started with. You might be able to use energy to rearrange what's inside, but you can't create something from nothing.
The Role of Entropy
Here is the part that most people miss: entropy. Entropy is basically a measure of disorder or randomness.
In a closed system, entropy is a relentless killer. Think about it: because no new energy or matter is coming in to organize the system, things naturally tend to move toward chaos. A closed system eventually runs out of "useful" energy and settles into a state of equilibrium—which, in many cases, is just a fancy way of saying it becomes dead or useless.
People argue about this. Here's where I land on it Simple, but easy to overlook..
Open systems fight entropy. They use the energy flowing in from the outside to build structure, maintain order, and grow. On the flip side, this is why life exists. Life is essentially a temporary, beautiful rebellion against entropy, powered by the constant intake of energy from the sun and food.
Identifying the Boundaries
So, how do you actually determine which system you're looking at? You have to ask two specific questions:
- Can matter cross the line? (Can physical stuff move in or out?)
- Can energy cross the line? (Can heat, light, or work move in or out?)
If the answer to both is yes, it's open. On top of that, if the answer to the first is no but the second is yes, it's closed. If the answer to both is no, it's isolated.
Common Mistakes / What Most People Get Wrong
I see this mistake all the time in management and personal productivity.
Mistake #1: Treating a human as a closed system. We often talk about "burnout" as if it's just a lack of willpower. But humans are biological open systems. We require sleep, nutrition, and social interaction to maintain our internal order. When people try to "optimize" themselves by cutting out rest or social time to save "energy," they are treating themselves like a closed system. They are ignoring the fact that they need external inputs to function. You can't just rearrange your internal thoughts to fix exhaustion; you need new matter (food) and new energy (rest).
Mistake #2: Confusing "closed" with "secretive." In a corporate setting, people often say, "We need to keep this project closed." They usually mean they want to keep it confidential. But in a systems sense, a "closed" project is one that doesn't take feedback. If a team is working in a vacuum without any external input or testing, they aren't being "focused"—they are becoming a closed system, and they are almost certainly going to fail because they aren't reacting to the environment Simple, but easy to overlook. Still holds up..
Mistake #3: Forgetting about energy in closed systems. People often think a closed system is "stuck." It's not. A closed system can still change quite a bit, provided energy is moving through it. A sealed battery is a closed system regarding matter, but it's doing massive amounts of work because of the energy moving through its chemical components Easy to understand, harder to ignore. Surprisingly effective..
Practical Tips / What Actually Works
Whether you are an engineer, a manager, or just someone trying to get your life together, here is how you apply this.
Audit Your Systems
Take a look at a major part of your life—your career, your health, or a specific project. Ask yourself: "Is this system open or closed?"
If you feel like you're stagnating, you've likely turned an open system into a closed one. You've stopped taking in new information, you've stopped meeting new people, and you've stopped trying new methods. To fix it, you need to break the seal. You need to introduce new "matter" (new ideas, new skills, new perspectives).
Manage the Inputs
If you have an open system, your success depends entirely on the *quality
Continue: Managing the Inputs
Your success in an open system hinges on the quality of the inputs you allow. Imagine a garden: even the healthiest plant will wither if it’s fed poor soil, contaminated water, or invasive weeds. Similarly, your career, health, or personal growth thrives only when you intentionally curate what enters your system. This means prioritizing high-value interactions, resources, and information while filtering out noise, misinformation, or energy-draining distractions Simple, but easy to overlook..
Here's a good example: in a professional context, this could mean seeking mentorship from experts rather than relying on generic advice, or investing in tools that streamline work instead of adopting every new app promising productivity. Still, in health, it might involve choosing nutrient-dense foods over processed options or prioritizing rest over constant stimulation. The goal isn’t to block all inputs—it’s to make sure what comes in supports your system’s goals Simple, but easy to overlook..
It sounds simple, but the gap is usually here.
To manage inputs effectively, ask:
- So **What am I consuming? In real terms, ** (Information, relationships, tasks, media. In real terms, )
- **Does this align with my objectives?That's why ** (Does it add value, or is it a distraction? Now, )
- Am I open to feedback? (Even critical feedback is a vital input for growth.
Some disagree here. Fair enough.
By consciously steering what enters your system, you transform potential chaos into strategic advantage.
Conclusion
Understanding whether a system is open, closed, or isolated isn’t just an abstract concept—it’s a practical framework for navigating life, work, and relationships. Humans are inherently open systems, requiring external inputs to thrive, yet we often fall into the trap of closing ourselves off through burnout myths, secrecy, or neglect of energy management. The key lies in intentionality: auditing our systems to identify where we’ve unintentionally sealed them off, then actively managing the flow of matter, energy, and information to keep them dynamic and responsive.
In a world that often glorifies isolation or over-optimization, embracing the principles of open systems reminds us that growth, innovation, and resilience depend on our willingness to learn, adapt, and connect. Whether you’re leading a team, improving your health, or simply seeking balance, recognize that your success is not just about what you do internally—but about how you engage with the world around you. By keeping our systems open and our inputs intentional, we access the potential to evolve, not just survive.
