Soft-surface stability basics
One mental model for cushions, seams, carpet, and ottomans: tilt + wobble + bumps. Fix the stability, not just the symptoms.
Definition: Soft surfaces deform, creating tilt + wobble that amplifies bumps into tip-overs.
The one mental model
- Deformation creates tilt
- Tilt creates wobble
- Wobble makes bumps dangerous
The one diagnostic
If it passes the couch seam test, it’s far more likely to work across soft surfaces.