Sphere

You call me a Circle; but in reality I am not a Circle, but an infinite number of Circles...  For even a Sphere -- which is my proper name in my own country -- if he manifest himself at all to an inhabitant of Flatland -- must needs manifest himself as a Circle.

-- Edwin Abbott Abbott (1838-1926), English schoolmaster, theologian, and author, Flatland, Chapter 16, "How the Stranger Vainly Endeavoured to Reveal to Me in Words the Mysteries of Spaceland (1884)