TRIZ Motion Inversion
Unlock constrained systems by swapping what moves and what stays still
- Difficulty
- Advanced
- Time to result
- ~months to results
- Steps
- 3
- Confidence
- 91%
TRIZ Motion Inversion is a creative prompt: make the thing that stays still move, and make the thing that moves stay still. First map the system's fixed and mobile parts, then identify costs created by that arrangement. Reverse one pair conceptually and trace the effect on flow, capacity, infrastructure and user experience. The airport example replaces aircraft taxiing to gates with mobile lounges that carry seated passengers to aircraft parked nearer the runway. The inversion can reduce taxiing, gate construction and expansion costs because new capacity comes from buying vehicles rather than rebuilding terminals. The framework does not presume every reversal is viable. Its purpose is to expose design space hidden by an assumption so familiar that teams no longer recognize it as a choice.
Origin
Sutherland cites a Soviet-era TRIZ innovation principle while discussing Washington Dulles mobile lounges designed to carry passengers to aircraft rather than bring every aircraft to a gate.
Core principles
- 01System assumptions often hide inside what is fixed
- 02Reversing motion can relocate a bottleneck
- 03A mobile interface can reduce fixed infrastructure
- 04Inversion should improve the whole system, not merely appear novel
How to run it
- 1
Map motion and stillness
List the components that move and those treated as fixed. Note the costs, delays and infrastructure attached to each assumption.
Pro tip Include people, information and service interfaces, not only machinery.
- 2
Reverse one pair
Hold the moving element still and mobilize the fixed element in a thought experiment. Trace the new flow from beginning to end.
Pro tip Start with the largest or costliest moving asset.
Watch out Do not discard safety and regulatory constraints during evaluation.
- 3
Test system economics
Compare capacity, capital cost, operating cost and user friction with the original arrangement. Prototype only inversions that improve the whole system.
Pro tip Value modular expansion explicitly.
Watch out A clever reversal that shifts the bottleneck elsewhere is not an improvement.
In the wild
At Washington Dulles, passengers can sit inside a room-like mobile lounge that drives to the aircraft. Planes need not taxi to a conventional gate, and airport expansion can add vehicles instead of committing immediately to major new terminal construction.
→ Movement shifts from the aircraft to a modular passenger interface.
Common mistakes
Inverting for spectacle
The reversal must improve constraints, economics or experience rather than simply create an unusual mechanism.
Ignoring the new bottleneck
Moving a formerly fixed component can introduce storage, traffic or maintenance constraints elsewhere.
Is it for you?
Best for
Operational and service systems constrained by expensive fixed infrastructure, queues or repeated movement of large assets.
Not ideal for
Systems where the motion pattern is imposed by safety, physics or regulation and cannot practically be reversed.
From the transcript
“make the thing that stays still move and make the thing that moves stay still.”
From the episode
Waymo, Texas Culture, Airline Lounges, OpenAI & Uber Eats - Rory Sutherland - #973 -