FE Meme
Shoes Are Flat: So Earth Must Be?
#138: If Earth were not flat, shoes would be curved to match the ground, since soles are flat, the planet must be flat too.
The Meme
Black background with cyan/magenta text "IF THE EARTH ISN'T FLAT: WHY ARE SHOES LIKE THIS: AND NOT LIKE THIS:" above two blue cartoon shoes, one with a flat sole, one bent to match a curved surface.
Why It Spreads
The intentionally ridiculous shoe analogy is delivered like a serious proof, with bright cyan and magenta text that makes the gotcha easy to screenshot. Viewers share it as absurdist humor that still plants the idea that everyday flat soles somehow testify against planetary curvature.
What It Gets Wrong
The cyan/magenta header asks "IF THE EARTH ISN'T FLAT: WHY ARE SHOES LIKE THIS: AND NOT LIKE THIS:" above cartoon soles, treating footwear as a scale model of the planet. A size-10 sole spanning perhaps 25 cm sees effectively zero arc on a body with R ≈ 6371 km, where h ≈ d²/(2R) over 10 km still reaches metres. Local pavements look flat while cumulative survey lines curve over kilometres; bent cartoon shoes are a category error, not a measurement. TestTheGlobe's No Curvature Is Visible and TestTheGlobe's Curvature Calculator walk through the observations and predictions this image skips.
The Debunk
On R ≈ 6371 km, h ≈ d²/(2R) predicts effectively zero drop over a ~25 cm shoe sole but metres of curvature over 10 km; that fits why footwear and local pavements look flat. Cartoon blue shoes with flat versus bent soles are inconsistent with geodetic surveys that close on ellipsoid datums over kilometre baselines. Use TestTheGlobe's Curvature Calculator to compare the meme's claim with a measurable prediction.
- TestTheGlobe's Curvature Calculator shows that over 25 cm, h ≈ d²/(2R) is effectively zero, while over 10 km it reaches metres on R ≈ 6371 km.
- TestTheGlobe's No Curvature Is Visible page explains why local surfaces look flat at human scale without disproving a large-radius sphere.
- TestTheGlobe's No Curvature Is Visible: surveyed geodetic arcs, bridge pylons, and tunnel alignments account for Earth's radius over long distances, something shoe soles never need to do.
- TestTheGlobe's Down Is The Same Everywhere: flat-Earth claims still must answer flight paths, eclipses, and opposite seasons; cartoon footwear does not.