The complicated dynamics of logistic maps with four fundamental operat
ions in the polar coordinates are analyzed in this paper. Iterations o
f single logistic map in polar coordinates exhibit similar characteris
tics as in the Cartesian coordinates. Iterations of double logistic ma
ps, however, are more interesting in polar coordinates than those in C
artesian coordinates. Under different iterative rules, the dynamics of
double logistic maps show some funny artistic patterns. Some of them
look like the formation of an embryo, and some even look Like Taiji di
agram, which is the representative symbol of Taoism in ancient China.
It is interesting to see that Taiji, which is believed in Taoism to be
the mysterious origination of the world, is an interim phenomenon wit
hin the evolution of the systems governed by the law of the logistic e
quations.