: 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
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. : Cutting two identical arcs from the rims
: Two sleeves from a coffee shop are identical but will exhibit this illusion when placed side-by-side. : Cutting two identical arcs from the rims