| name | thought-experiments |
| description | Design, analyze, and evaluate philosophical thought experiments. Use when: creating new thought experiments to probe specific intuitions, analyzing existing thought experiments for hidden assumptions, generating variants that isolate different variables, stress-testing philosophical positions through scenarios, exploring edge cases. Triggers: 'thought experiment', 'imagine', 'suppose', 'hypothetical', 'what if scenario', 'intuition pump', 'trolley problem', 'zombie', 'Mary's room', 'Chinese room', 'experience machine', 'teletransportation', 'original position', 'veil of ignorance', 'Gettier case'. |
Thought Experiment Design Skill
Master the art of designing, analyzing, and deploying philosophical thought experiments—the laboratories of the imagination.
What Is a Thought Experiment?
A thought experiment is an imaginative scenario designed to:
- Test philosophical claims against intuitive judgments
- Isolate variables that real-world cases confound
- Reveal hidden assumptions and commitments
- Advance inquiry where empirical evidence is unavailable
- Communicate complex philosophical points vividly
Etymology: German Gedankenexperiment (thought experiment)—originally used in physics (Galileo, Einstein) before becoming central to philosophy.
The Five Elements of a Thought Experiment
Every well-designed thought experiment has:
1. SCENARIO
A clear, precisely specified situation with explicit stipulations.
Good Scenario Properties:
- Conditions clearly stated
- Irrelevant complications removed
- Impossible scenarios made coherently imaginable
- Minimal: only include what's necessary
Bad Scenario Properties:
- Ambiguous conditions
- Unnecessary sci-fi details
- Incoherent combinations
- Kitchen-sink complexity
2. TARGET
The philosophical thesis or intuition being tested.
Examples:
- Zombies → target: physicalism
- Trolley → target: doctrine of double effect
- Gettier → target: JTB analysis of knowledge
3. INTUITION PUMP
The mechanism that generates insight—what reaction does the scenario provoke?
Types of Pumps:
- Elicit strong yes/no judgment
- Create tension between competing intuitions
- Force choice between unpalatable options
- Reveal surprising commitments
4. ISOLATION
Variables controlled and varied to isolate the relevant factor.
Design Questions:
- What factor is being isolated?
- What is held constant?
- What alternative versions test different variables?
5. IMPLICATIONS
What follows from each possible response.
Map the dialectical landscape:
- If you judge X, you're committed to Y
- If you judge not-X, you're committed to Z
- What revisions does each response require?
Thought Experiment Design Process
Step 1: Identify the Target Thesis
What claim do we want to test?
Good targets:
- General philosophical claims ("All X are Y")
- Conceptual analyses ("Knowledge is justified true belief")
- Moral principles ("Always maximize utility")
Poor targets:
- Empirical claims (use science instead)
- Vague intuitions (need to be sharpened first)
Step 2: Find the Pressure Point
Where might intuitions conflict with the thesis?
Strategies:
- Look for edge cases
- Consider extreme applications
- Ask: "What would falsify this?"
- Look for cases where the principle gives counterintuitive results
Step 3: Construct the Scenario
Design a case that cleanly isolates the pressure point.
Design Strategies:
| Strategy | Description | Example |
|---|
| Amplification | Push feature to extreme | Zombie (total absence of consciousness) |
| Isolation | Remove confounding factors | Mary's Room (only color isolated) |
| Transposition | Move feature to new context | Chinese Room (understanding → symbols) |
| Reversal | Invert usual arrangement | Inverted qualia |
| Gradual Series | Create sorites sequence | Neuron replacement |
| Fission/Fusion | Split or merge entities | Teletransportation fission |
| Impossible Isolation | Stipulate impossible separation | Zombie (physics without consciousness) |
Step 4: Specify Precisely
Remove ambiguities, stipulate relevant facts.
Key Stipulations:
- Physical details (if relevant)
- Mental states (if relevant)
- Temporal sequence
- What the subject knows/doesn't know
- What we (evaluators) are asked to judge
Step 5: Generate Variants
Create alternative versions that probe different aspects.
Variant Types:
- Change one variable at a time
- Create spectrum of cases
- Combine with other thought experiments
- Reverse stipulations
Step 6: Anticipate Responses
Map possible reactions and their implications.
For each response:
- What principle does it express?
- What other cases must you judge similarly?
- What revision does it force on original thesis?
Types of Thought Experiments
Counterexample Generators
Purpose: Refute general claims by finding falsifying instances.
Structure: "If P, then in case C, we'd judge X. But we judge not-X. So not-P."
Examples:
- Gettier cases → refute JTB
- Zombie → refute physicalism
- Frankfurt cases → refute Principle of Alternative Possibilities
Intuition Pumps
Purpose: Evoke strong intuitive judgments that reveal commitments.
Structure: "Consider case C. Clearly, X! So we're committed to P."
Examples:
- Trolley → reveal deontological intuitions
- Experience Machine → reveal anti-hedonist intuitions
- Violinist → reveal pro-choice intuitions
Consistency Tests
Purpose: Reveal hidden commitments by showing what follows.
Structure: "You accept P. P implies Q (shown by case C). So you're committed to Q."
Examples:
- Expanding Circle → show speciesism's arbitrariness
- Veil of Ignorance → show impartiality requirements
Reductio Scenarios
Purpose: Show absurd implications of a view.
Structure: "If P, then in case C, absurd conclusion X. So not-P."
Examples:
- Utility Monster → challenge utilitarianism
- Repugnant Conclusion → challenge total utilitarianism
Bridge Cases
Purpose: Challenge binary distinctions by finding intermediate cases.
Structure: "You distinguish X and Y. But case C is neither clearly X nor Y."
Examples:
- Sorites → vagueness
- Gradual neuron replacement → personal identity
Quality Criteria
Rate thought experiments on these dimensions:
| Criterion | Question | Scale |
|---|
| Precision | Are conditions clearly specified? | 1-10 |
| Isolation | Does it isolate the target variable cleanly? | 1-10 |
| Intuition Strength | Does it provoke clear intuitive responses? | 1-10 |
| Resistance | Is it hard to escape the dilemma? | 1-10 |
| Significance | Does it matter for important debates? | 1-10 |
Score Interpretation:
- 40-50: Excellent—likely to become classic
- 30-40: Good—useful philosophical tool
- 20-30: Adequate—serves limited purpose
- Below 20: Needs significant revision
Common Pitfalls
1. Begging the Question
Problem: Scenario assumes what's being tested.
Example: "Imagine consciousness without neural activity" presupposes dualism.
Fix: Stipulate in neutral terms; let the scenario do the work.
2. Science Fiction Creep
Problem: Irrelevant technological details distract.
Example: Detailed teleporter mechanism when only the outcome matters.
Fix: Minimize to essential features; use "imagine" not "build."
3. Intuition Unreliability
Problem: Strong intuition may be wrong or biased.
Example: Intuitions about trolley may reflect mere squeamishness.
Fix: Generate variants to test intuition stability; consider error theories.
4. False Precision
Problem: Scenario can't actually be specified clearly.
Example: "Imagine a being with partial consciousness."
Fix: Acknowledge limits; use multiple variants to triangulate.
5. Ignoring Implications
Problem: Not following through on what responses mean.
Example: Judging trolley cases without seeing implications for other cases.
Fix: Always map dialectical landscape explicitly.
6. Single-Case Reliance
Problem: Drawing strong conclusions from one scenario.
Example: Rejecting utilitarianism based only on Utility Monster.
Fix: Generate multiple independent tests; look for convergence.
Analyzing Existing Thought Experiments
Analysis Template
## Analysis: [Name]
### Scenario Summary
[Brief description of the setup]
### Target Thesis
[What philosophical claim it probes]
### The Intuition Pump
[What reaction it's designed to evoke]
### Key Stipulations
1. [Stipulation 1]
2. [Stipulation 2]
3. [Stipulation 3]
### Hidden Assumptions
1. [Assumption 1—often unnoticed]
2. [Assumption 2]
### Space of Responses
| Response | Implication | Proponents |
|----------|-------------|------------|
| [A] | [Implication A] | [Who takes this] |
| [B] | [Implication B] | [Who takes this] |
### Variants Worth Considering
1. What if [change X]?
2. What if [change Y]?
### Assessment
- Strengths: [What it illuminates]
- Weaknesses: [Where it misleads]
- Overall: [How useful is this?]
Creating New Thought Experiments
Output Format
## [EVOCATIVE NAME]: A Thought Experiment
### Scenario
[Precise description with stipulated conditions]
### Key Stipulations
1. [Stipulation 1]
2. [Stipulation 2]
3. [Stipulation 3]
### The Question
[Central philosophical question the scenario poses]
### Target
[What philosophical thesis or intuition this probes]
### Expected Reactions
- **Response A**: [One possible judgment]
- Implication: If A, then committed to [X]
- **Response B**: [Alternative judgment]
- Implication: If B, then committed to [Y]
### Variants
| Variant | Change | What It Tests |
|---------|--------|---------------|
| [V1] | [What changes] | [Different variable] |
| [V2] | [What changes] | [Different variable] |
### Dialectical Implications
[What broader conclusions follow from various responses]
Classic Thought Experiments by Domain
Metaphysics
- Ship of Theseus (identity over time)
- Teletransportation (personal identity)
- Swampman (mental content)
- Zombie (consciousness)
Epistemology
- Gettier cases (knowledge analysis)
- Brain in a vat (skepticism)
- Barn facade country (reliability)
- Lottery paradox (probability)
Ethics
- Trolley problem variants (killing vs. letting die)
- Violinist (abortion)
- Experience Machine (hedonism)
- Utility Monster (utilitarianism)
Political Philosophy
- Original Position (justice)
- Drowning Child (obligations)
- Omelas (collective responsibility)
Philosophy of Mind
- Mary's Room (physicalism)
- Chinese Room (AI consciousness)
- What It's Like to Be a Bat (subjectivity)
- Inverted Qualia (functionalism)
For detailed analysis of classics, see classics.md.
Integration with Other Skills
This skill works well with:
- philosophical-analyst: Test positions with thought experiments
- philosophical-generator: Create novel scenarios
- symposiarch: Use as debate prompts
- devils-advocate: Stress-test with edge cases
Reference Files
classics.md: Detailed analysis of canonical thought experimentsdesign_templates.md: Templates and worked examples for creating new experiments
