[Sevenfold]

Your 'happiness' level is being changed by your changing of what you think will make you happy.

Some contrived exaples:

If for instance, suppose humans 'breathed' through our skin and lungs were outdated organs.

But suppose your skin malfunctioned and you were forced to breath through your lungs. This constant in and out of air would very likely drive you insane.

Or take a lottery winner(s).

Two similiar people pick a winning ticket.

Person A Finds he has won $50. Person B has won $50 million. Two days later lottery officials citing a faulty drawing, pay both players 50K.

Two exact same payouts, huge difference in 'happiness'.