Oddly Wired
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perception

Your brain groups unrelated information into a single story.

A 1944 study showed that people reflexively attribute intentional personality traits to simple geometric shapes moving on a screen.

When observers see circles and triangles moving in specific patterns, they immediately construct complex narratives of aggression or helpfulness. The brain prefers a social drama over a description of physical movement.

You are hardwired to see intent where there is only geometry.

Where this comes from

Study
Heider & Simmel, 1944, American Journal of Psychology
What the check found
The Heider-Simmel study is a foundational, well-documented experiment in psychology. The absence of a direct quote from the provided text is expected, as it is a general knowledge claim rather than a specific numeric citation.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.