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Berkeley's Idealism and the Problem of Doubling in Size

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Abstract

This paper examines George Berkeley's immaterialist philosophy and applies it to a thought experiment: if everything in the world doubled in size simultaneously, would anyone notice? The paper argues that under Berkeley's view, all things are mind-dependent ideas, so no perceived change would occur because relative proportions would remain constant. It then extends the analysis to consider materialist alternatives, exploring how external observers, dimensional proportionality, and the frequency of change might affect perception. The discussion illuminates broader philosophical questions about the relationship between the material world and human perception.

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What makes this paper effective

It applies an abstract philosophical position — Berkeley's immaterialism — to a concrete, imaginative thought experiment, making the ideas accessible and testable.
It moves logically from a single philosophical premise (all things are ideas) through several real-world complications, such as external observers, dimensional proportionality, and cognitive adaptation.
It acknowledges the limits of Berkeley's framework by considering what materialists would say, demonstrating intellectual fairness and analytical depth.

Key academic technique demonstrated

The paper demonstrates applied philosophical analysis: it takes a canonical position from the history of philosophy and stress-tests it against a hypothetical scenario. Rather than merely summarizing Berkeley, the author interrogates the implications of his view and identifies edge cases — such as the role of an external observer like God, or the distinction between one-dimensional and volumetric doubling — where the theory requires further examination.

Structure breakdown

The paper opens by summarizing Berkeley's core idealist claim, then applies it to the doubling scenario. It progresses through a series of complications: the irrelevance of external size change if perception is relational; the role of matter for those who reject Berkeley; the geometric problem of proportional versus disproportional doubling; and finally, the cognitive and perceptual effects of frequency of change. Each section builds on the last, forming a tightly reasoned chain of philosophical inquiry.

Introduction to Berkeley's Idealism

George Berkeley argues that there is no material world beyond that which we perceive. All things, therefore, are strictly mind-dependent. He extends this argument further, holding that because all things are ideas, there cannot even be a physical thing that correlates to the idea of that thing.

Therefore, were everything in the world to suddenly and instantly double in size, this would only be occurring in the minds of people. The way our minds perceive things is typically in relation to other things, so if everything in this world doubled in size we would notice no difference at all, because no relative proportions would change in our minds, and because there was no physical change in size to begin with.

Perception Without an External Reference Point

If we were a being outside of this world — an alien, or God, perhaps — we might be able to perceive with our minds that there was a change in the size of this world and everything in it, because we would be external to it. However, Berkeley did not give consideration to how the minds of aliens or God might work, only those of man.

While Berkeley rejects the idea of matter, many others do not. Thus, if the world and everything in it doubled in size, we are left with a complex question. The first issue this raises goes back to the idea of perception. Even if matter exists, we must still perceive it. If this world and everything in it has doubled in size, we may not perceive this difference, because we perceive material objects in relation to all other physical objects, including ourselves.

The Problem of Matter and Relative Proportion

It is entirely possible under such a scenario that the size of material things could constantly be in a state of change — the universe itself perpetually expanding or contracting. Only an entity external to the universe, such as God, would be able to perceive such changes. The reason is straightforward: the size of the universe would be changing in relation to some external object that did not change in size.

Doubling in size could mean several different things. If "size" were taken only to mean mass, this could make the change disproportional in other dimensions, and we would perceive those changes. Only a doubling that was equally proportional in all respects could go unperceived.

2 Locked Sections · 265 words remaining

Dimensions, Mass, and Perceivable Change · 90 words

"Disproportional dimensional doubling creates perceptible differences"

Frequency, Adaptation, and the Limits of Perception · 175 words

"Frequent change triggers cognitive adaptation; rare change does not"

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Key Concepts in This Paper

Berkeley's Idealism Mind-Dependence Thought Experiment Relative Proportion External Observer Immaterialism Cognitive Adaptation Dimensional Scaling Material World Perceptual Limits