Oddly Wired
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perception

Your visual size perception is easily manipulated.

The Ebbinghaus illusion was popularized by Edward B. Titchener in his 1901 textbook.

Titchener, 1901

Your judgment of reality is relative to the context surrounding it.

Where this comes from

Study
Ebbinghaus, 1902
What the check found
The phenomenon description is correct, but the citation date and attribution to an 'Ebbinghaus, 1902' source are inaccurate; the illusion was popularized by Titchener in 1901.
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.