Designing for many
Applying the method to a household rather than a person — where needs overlap in time and bodies differ in ability. Layer's time-sharing extends to people (stagger routines), and the method's rules bend to the actual bodies: a child's height, an elder's reach, anyone's mobility.
Choreograph people, not just furniture
The grandmother's daily medicines belong in the easy middle zone she can safely reach, even if the reach rule says rare-things-high. The rules are servants, not masters — designing for many means designing for each.