- Article
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A Thickness Illusion: Horizontal Is Perceived as Thicker than Vertical
- Jasper M. De Waard,
- Erik Van der Burg and
- Christian N. L. Olivers
We report two psychophysical experiments that investigate a visual illusion that is considered common knowledge among type designers, but has never been studied scientifically. Specifically, the thickness of a horizontal line is overestimated in rela...

