  While gravitationally lensed quasars are expected to display an odd number of
images, invariably systems are observed with an even number of quasars. For
this, lensing galaxies must have very small core radii; this provides strong
demagnification of one of the images. High resolution imaging of the
gravitationally lensed BAL quasar, APM08279+5255, reveals three point-like
images. As these images possess similar colours, it has been suggested that
each represents a lensed image. Here, spatially resolved spectra of the
individual components, obtained with STIS on the HST, are presented, clearly
revealing that each is an image of the quasar. This confirms that APM08279+5255
represents the first example of an odd-image gravitationally lensed system. The
implications for the properties of the lensing galaxy are discussed. It is also
found that the individual images possess spectral differences indicative of the
influence of gravitational microlensing in this system.
