perception

Distance alters your perception of size without your consent.

Mario Ponzo first demonstrated the illusion in 1911.

Change 1913 to 1911.

Your brain prioritizes depth perception over raw geometric data.

Where this comes from

Study: Mario Ponzo, 1913, Ponzo Illusion
What the check found: The scientific description of the illusion is correct, but the attribution year is off by two years.
Confidence: Well replicated

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