: Your brain performs an "unfair comparison" by matching the shorter inner radius of one arc against the longer outer radius of the adjacent arc.
: You can easily recreate this yourself with simple household items: : Your brain performs an "unfair comparison" by
While your specific title mentions "Healthy and Sport News," these illusions frequently appear in "Healthy Aging" or "Mental Health" sections of magazines (like Yahoo Lifestyle ) as "brain hacks" to illustrate how perception can differ from reality. Magic Arcs - The Spangler Effect Related Illusions in Media : This specific geometric
: Cutting two identical arcs from the rims of paper plates is a common science demonstration used to teach fair comparisons in experiments. Related Illusions in Media When placed next to each other in a
: This specific geometric version, often shared on news sites like Hindustan Times , was based on work by researcher Lydia Maniatis.
: Two sleeves from a coffee shop are identical but will exhibit this illusion when placed side-by-side.
The illusion typically presents two or three identical curved arcs. When placed next to each other in a specific staggered alignment, the arc on the bottom or side often appears significantly longer or larger than the one above or beside it.