From Ancient China
A Pair Either
had two pairs of boots, one with thick soles and the other with thin soles.
One morning he made the mistake of putting one of each of the boots on.
While walking, he felt very uncomfortable. "How strange! How it is
that my legs are not the same length today?" He said to himself in
told him, "Your boots are not a pair."
this, he hurried home to change boots. But when he got home and saw the
other boots, he thought for a moment and said, "There is no need
to change. These other two are not a pair either. One has a thick sole
and the other has a thin sole."
and Translated by Liu Jiangting et al.)