When you don’t get rid of things you aren’t using, you are blinding yourself to a critical part of the consumer experience: what happens to things when you’re done with them. When you have the habit of periodically getting rid of things you aren’t using anymore, your brain begins to create links between the beginning (buying) and the end (selling) of all of your stuff.
Tynan, Superhuman by Habit: A Guide to Becoming the Best Possible Version of Yourself, One Tiny Habit at a Time, 2014
[U]nless you’re extremely organized, a house full of stuff can be very depressing. A cluttered room saps one’s spirits. One reason, obviously, is that there’s less room for people in a room full of stuff. But there’s more going on than that. I think humans constantly scan their environment to build a mental model of what’s around them. And the harder a scene is to parse, the less energy you have left for conscious thoughts. A cluttered room is literally exhausting.
Paul Graham, ‘Stuff’, July 2007