Created by Observation

Observation and Reality

People have always tried to work out what reality actually is. At a practical level, it feels stable and independent. Objects exist whether we look at them or not. But when physics started probing smaller and smaller scales, that assumption stopped being so straightforward.

Quantum mechanics does not say that reality depends on human awareness, but it does show that the way systems behave depends on how they are measured. The double-slit experiment is the standard example. When particles such as electrons pass through two slits without being measured, they produce an interference pattern consistent with wave behaviour. When a measurement is introduced to determine which slit they go through, that pattern disappears and the result looks particle-like.

What matters here is not watching in a human sense, but interaction. Measurement in physics means a physical interaction that extracts information from a system. That interaction changes the system. The outcome is not just revealed. It is partly defined by the conditions of measurement.

In the formalism of quantum mechanics, systems are described by a wavefunction, which encodes probabilities of different outcomes. When a measurement occurs, one outcome is realised. How exactly that transition happens is still debated. Some interpretations treat it as a real physical process, others treat it as an update in our knowledge.

The Copenhagen interpretation, often associated with Niels Bohr, avoids making strong claims about what is really happening between measurements. It focuses on what can be observed and predicted. Other interpretations, like many-worlds, remove the idea of collapse entirely and instead say that all outcomes occur in different branches of reality.

The key point is this. At the quantum level, the idea of a fully observer-independent, well-defined state at all times is difficult to maintain. That does not mean reality is created by consciousness, but it does mean that interaction, the act of obtaining information, is built into how physical outcomes emerge.

Once that is accepted, even in a limited sense, it raises a broader question. If observation in the form of interaction is fundamental at small scales, is it purely local, or is it part of a deeper structure that applies more widely?

From Quantum Systems to the Universe

Extending quantum ideas to the entire universe is not straightforward. Quantum mechanics was developed to describe small systems, while cosmology deals with the universe as a whole. Still, modern physics increasingly treats the early universe in quantum terms.

The Big Bang model describes how the universe expanded from a hot, dense early state. It does not describe a conventional explosion in space, but rather the expansion of space itself. As we trace the universe back in time, densities and temperatures increase, and classical physics eventually breaks down. At that point, quantum effects become important.

In quantum cosmology, the early universe can be described using a wavefunction, similar in principle to smaller systems. This raises a subtle issue. If the entire universe is described quantum mechanically, what counts as a measurement? There is no external observer in the usual sense.

One approach is to treat different parts of the universe as measuring each other through interaction. As systems interact and become entangled, certain outcomes become effectively fixed from the perspective of subsystems. This idea is closely related to decoherence, which explains why classical behaviour emerges from quantum systems without requiring a special observer.

Decoherence does not solve every interpretational question, but it does show that classical reality can arise naturally from quantum rules when systems interact with their environment. In that sense, observation can be understood as interaction plus information becoming effectively irreversible.

This reframes the earlier question. Instead of asking whether consciousness creates reality, a more precise question is whether the structure of reality depends fundamentally on information exchange and interaction. In modern physics, that idea is taken seriously.

Why the Universe Looks the Way It Does

The universe we observe has very specific properties. Physical constants fall within narrow ranges that allow stable atoms, stars, and long-lived structures to exist. Small changes in these values would produce a very different universe.

The anthropic principle addresses this by pointing out a selection effect. We observe a universe compatible with our existence because otherwise we would not be here to observe it. This is not an explanation in the usual causal sense, but it does limit what we should expect to see.

In some cosmological models, especially those involving inflation or multiverse scenarios, many regions of spacetime could exist with different physical parameters. If that is the case, then our universe might be one of many, and its properties would not need to be uniquely determined from first principles.

The many-worlds interpretation of quantum mechanics approaches multiplicity differently. Instead of multiple universes with different constants, it proposes branching outcomes from quantum events. Each branch is internally consistent, but all are part of a larger structure described by a single wavefunction.

These ideas are still speculative and not directly testable in their full form. But they show that modern physics is open to the possibility that what we observe is not the only real configuration, but one realised instance among many possibilities.

Is Our Universe Part of Something Larger?

Another line of thought is that the observable universe is not a complete system, but part of a larger structure. This idea appears in several areas of theoretical physics, although in very different forms.

The holographic principle, for example, suggests that the information contained within a volume of space can be described by data on its boundary. This emerged from studies of black hole thermodynamics and has been developed in string theory through the AdS/CFT correspondence. While highly technical, the core idea is that our usual notion of spatial dimensionality may not be fundamental.

If correct, this would mean that what we perceive as a three-dimensional universe could be described in terms of information defined on a lower-dimensional surface. That does not mean we are living in a literal projection in a simple sense, but it does suggest that the underlying description of reality may differ from how it appears.

There are also models where universes can form from quantum fluctuations, or where spacetime itself emerges from more fundamental structures. In these frameworks, the Big Bang is not necessarily the absolute beginning, but a transition within a broader system.

None of these models require an external observer in the everyday sense. However, they do reinforce a consistent theme. The observable universe may not be the most fundamental layer of reality.

What Role Does Observation Actually Play?

It is important to be precise here. In physics, observation does not mean human awareness. It refers to physical interaction that leads to a definite outcome. That interaction can involve detectors, fields, particles, or environments. It does not require a mind.

The idea that consciousness collapses the wavefunction is one interpretation, but it is not required by the theory itself. Most working physicists treat measurement as a physical process governed by the same laws as everything else.

What is less controversial is that information is fundamental. Physical systems carry information, and interactions transfer and transform it. Some modern approaches to physics, including quantum information theory, treat information as a core building block rather than just a description tool.

From that perspective, reality is not just made of particles and fields, but also of relationships and information flow. What we observe is the result of those relationships becoming definite in specific contexts.

This view avoids the need for a special observer while still acknowledging that outcomes depend on interaction. It also aligns better with experimentally supported physics.

Rethinking the Idea of a Beginning

We tend to think of existence in terms of a timeline with a clear starting point. The Big Bang is often treated as that point. But in physics, the beginning is not well defined in the usual sense.

As we approach extremely early times, our current theories stop being reliable. General relativity predicts singularities, but those likely signal the breakdown of the theory rather than a literal physical point. A complete theory of quantum gravity would be needed to describe that regime properly.

Some models replace the idea of a beginning with a transition. For example, a bounce from a prior contracting phase, or a fluctuation within a larger quantum state. Others suggest that time itself may not be fundamental at the deepest level.

If time is emergent, then asking what happened before the Big Bang may not make sense in the usual way. Instead, the universe could be part of a broader structure where time, space, and causality arise under specific conditions.

This does not remove the mystery, but it shifts it. Rather than focusing only on an origin, the question becomes how structure, order, and observable reality continuously arise from underlying rules.

In that sense, observation, understood as interaction and information becoming definite, is not something that happens after reality exists. It may be part of the ongoing process through which reality takes shape.

References

• Niels Bohr and the Copenhagen interpretation
• The double-slit experiment and wave-particle duality
• Brandon Carter and the anthropic principle
• Hugh Everett III and many-worlds
• Gerard ’t Hooft and Leonard Susskind on the holographic principle
• Nick Bostrom and the simulation argument