The cross, though it has at its head a collision and a contradiction, can extend its four arms for ever without altering its shape. Because it has a paradox in its center it can grow without changing. The circle returns upon itself and is bound. The cross opens its arms to the four winds; it is a signpost for free travelers.
—G.K. Chesterton in Orthodoxy (1908)
(I took this picture at the Afghan Church in Mumbai, India.)