Are the points of w^z two intersecting equiangular spirals?



Penrose in his book Road to Reality says that If w and z are both
complex numbers,
then w^z = e^(zlog w) = e^(z(r + i(theta + 2n*pi)))
so that any choice of w^z can be multipled or divided by e^(i2*n*pi).
He then says that the values of w^z are the intersection of two equi-
angular spirals.

Can someone please explain how this is true?

Thanks.

.



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