All over the world there must be far-reaching changes in animal behavior and habitat; if only one could have another life in which to chart it all...… - Brian Aldiss

-Expansion to your ego, friend.
-At your expense.

"So what's this "sad" business mean, anyway? I mean, how often do you feel like doing it?'
'Sad? Oh, sadness is just happiness in reverse. We humans have to put up with it. Just being human is an awful burden to bear.'
'You keep on doing it? Is that why you feel compelled to collect all these old secondhand sunsets?"

He gets bored with the effort of trying to think, and is unhappy because he knows thinking, or at least “thinking-to-a-purpose” is on the black list of party activities.