  Analysis of AR Sco optical light curves spanning nine years show a secular
change in the relative amplitudes of the beat pulse pairs generated by the two
magnetic poles of its rotating white dwarf. Recent photometry now shows that
the primary and secondary beat pulses have similar amplitudes, while in 2015
the primary pulse was approximately twice that of the secondary peak. The
equalization in the beat pulse amplitudes is also seen in the linearly
polarized flux. This rapid evolution is consistent with precession of the white
dwarf spin axis. The observations imply that the pulse amplitudes cycle over a
period of $\gtrsim 40$ yrs, but that the upper limit is currently poorly
constrained. If precession is the mechanism driving the evolution, then over
the next 10 years the ratio of the beat pulse amplitudes will reach a maximum
followed by a return to asymmetric beat pulses.
