A more extreme version of the interpersonal is that (one might suppose) you could have two (otherwise*) identical universes such that in the first Bob answers “3” and in the second Bob answers “5″, where both Bob’s feel (currently) the same way (largely*), but a) used different reference points within their life, or b) focus on different things—perhaps in universe 1 Bob thinks or says “my life could be better − 3”, but in universe 2 Bob thinks or says “my life could be worse** − 5′.
*This might require some assumptions about Bob, that don’t necessarily apply to everyone.
**Perhaps in universe 2, it occurs to Bob that he’s never had cancer, or anything of similar magnitude.
A more extreme version of the interpersonal is that (one might suppose) you could have two (otherwise*) identical universes such that in the first Bob answers “3” and in the second Bob answers “5″, where both Bob’s feel (currently) the same way (largely*), but a) used different reference points within their life, or b) focus on different things—perhaps in universe 1 Bob thinks or says “my life could be better − 3”, but in universe 2 Bob thinks or says “my life could be worse** − 5′.
*This might require some assumptions about Bob, that don’t necessarily apply to everyone.
**Perhaps in universe 2, it occurs to Bob that he’s never had cancer, or anything of similar magnitude.