Abstract
We rediscuss the evidence that the peculiar faint blue star AM CVn (=HZ 29) is an ultra-short-period cataclysmic binary. The existence of at least two noncommensurate short periods in the light curve, plus the recent discovery of the class of pulsating DB white dwarfs, suggests a need for reappraisal of the binary star model. Reckoned as a cataclysmic variable, AM CVn is extremely unusual: it never erupts, never changes its spectrum, barely flickers, shows suspiciously blue colors, and fails to reveal a stable photometric period despite titanic efforts to discover it. But many of its properties suggest a similarity to the known DB pulsators
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