Experimental study of apparent behavior. Fritz Heider & Marianne Simmel. 1944
Why the open web links it
A classic psychological experiment showing how people attribute intent and behavior to simple moving shapes.
Linked by 13 independent sites, 3 of them widely read in the 2026-10 crawl of the open web, including libretexts.org, sussex.ac.uk, degreed.com, we-make-money-not-art.com, nobaproject.com.