  The five enigmatic Cocoon stars after which the Quintuplet cluster was
christened have puzzled astronomers since their discovery. Their extraordinary
cool, featureless thermal spectra have been attributed to various stellar types
from young to highly evolved, while their absolute luminosities places them
among the supergiants. We present diffraction-limited images from the Keck 1
telescope which resolves this debate with the discovery of rotating spiral
plumes characteristic of colliding-wind binary "pinwheel" nebulae. Such elegant
spiral structures, found around high-luminosity Wolf-Rayet stars, have recently
been implicated in the behavior of supernovae lightcurves in the radio and
optical.
