Un/satisfying gif albums are scratching a very human itch. Where does it come from, and does it mean anything?
Perception of Symmetry in Infancy, Bornstein et al - http://www.princeton.edu/~cggross/Dev_Psych_1981.pdf
Bilateral symmetry and sexual selection: a meta-analysis, Møller and Thornhill https://www.ncbi.nlm.nih.gov/pubmed/18811416
Sorting preference in children with autism: the dominance of concrete features, Ropar and Peebles - https://www.ncbi.nlm.nih.gov/pubmed/16897382
The Existential Satisfaction of Things Fitting Perfectly Into Other Things, Julie Beck - https://www.theatlantic.com/health/archive/2015/08/the-existential-satisfaction-of-things-fitting-perfectly-into-other-things/401213/
The Dollar Auction Game: A Paradox in Noncooperative Behavior and Escalation, Martin Shubik - http://www.math.toronto.edu/mpugh/Teaching/Sci199_03/dollar_auction_1.pdf
What is Godel’s Theorem?, Melvin Henriksen - https://www.scientificamerican.com/article/what-is-godels-theorem/
Pythagorean Tuning - https://www.youtube.com/watch?v=ehmXCaJ8-Ts
The Square Root of Two, Numberphile - https://www.youtube.com/watch?v=5sKah3pJnHI
Things Fitting Perfectly into Other Things blog - http://thingsfittingperfectlyintothings.tumblr.com/
“Perfect Fit” Subreddit - https://www.reddit.com/r/Perfectfit/
“Oddly Satisfying” Subreddit - https://www.reddit.com/r/oddlysatisfying/
“Organization Porn” Subreddit - https://www.reddit.com/r/OrganizationPorn/
“Mildly Infuriating” Subreddit - https://www.reddit.com/r/mildlyinfuriating/
“Slightly Unsatisfying” Subreddit - https://www.reddit.com/r/slightlyunsatisfying/
Creepy Out of Tune Piano - https://www.youtube.com/watch?v=qv2my4a331A