It has long been observed that domestic cats, Felis catus, exhibit a persistent behavioral trait: the deliberate displacement of objects from elevated surfaces. This phenomenon, colloquially known as “knocking stuff off,” provides an underexplored dataset for understanding the geometry of our world. If the Earth were flat—as some claim—then by now every portable object would have been propelled into the abyss by our species’ most dedicated experimenters: cats.
Assume:
A flat Earth with a radius large enough to support known landmasses.
Cats distributed globally since at least the early Bronze Age (~3300 BCE).
Cats continue their known behavior of pushing objects from elevated surfaces toward the nearest edge.
If the Earth had edges, every cat would, through curiosity and persistence, eventually discover and exploit them.
Let:
C C = estimated global cat population at any time.
O O = average objects knocked off per cat per day.
D D = distance from any point to the “edge” of the flat Earth.
Historical approximations:
Even a conservative Bronze Age cat population (wild and semi‑domesticated) might be ~100,000 cats.
Modern house cats knock an average of 3 small items off per day. Ancient cats were likely no less industrious: O=3 O=3.
Over 5,000 years, total potential object displacements = C×O×365×5000 C×O×365×5000.
Thus:
100,000×3×365×5000=547,500,000,000 100,000×3×365×5000=547,500,000,000 opportunities to “test” the edges. Over half a trillion edge tests.
Even if only 0.001% of these tests reached the Earth’s “edge,” millions of objects would have been lost into the void. Yet there are no historical records of objects vanishing off the side of the world or cats peering smugly into infinity.
Since the oceans have also failed to pour off the alleged edge, the only reasonable conclusion—using the undeniable experimental rigor of cats—is that the Earth is not flat but bowl‑shaped. The bowl curvature naturally contains the oceans, that’s how the oceans stay in!
True story I actually did convince a flat earth believer that earth was bowl-shaped with those passages back in 2009. I was trying to make them see how silly it was, but did not get the intended results. Oops.