Here is a bit of light verse from the pen of John Updike (1932-2009).
ZULUS LIVE IN LAND
WITHOUT A SQUARE by John Updike
A Zulu lives in a round world. If he does not leave his reserve.
he can live his whole life through and never see a straight line.
--headline and text from The New York Times
In Zululand the huts are round,
The windows oval, and the rooves
Thatched parabolically. The ground
Is tilled in curvilinear grooves.