  Context. Debris disks are intrinsically connected to the planetary system's
formation and evolution. The development of high-contrast imaging techniques in
the past 20 years is now allowing the detection of faint material around bright
stars with high angular resolution, hence opening an avenue to study in detail
the structures of circumstellar disks and their relation to planetary
formation.
  Aims. The purpose of this paper is to revisit the morphology of the almost
edge-on debris disk around HD 15115.
  Methods. We analyzed data from the Gemini science archive obtained in 2009
and 2011 with the Near-Infrared Coronagraphic Imager instrument in the H and Ks
bands using coronagraphy and angular differential imaging tech- niques.
  Results. We resolved the disk in both the H and Ks bands. We confirmed the
position angles inferred by previous authors, as well as the brightness
asymmetry, which is the origin of the object's nickname, the blue needle. We
were able to detect the bow-like shape of the disk suspected from other
observations. However, these new NICI images suggest the presence of a highly
inclined ring-like disk of which we see the brighter side and the ansae located
at 90 AU symmetrically about the star. The inner part is likely depleted of
dust. The fainter side of the disk is suspected but not firmly detected, which
also indicates a large anisotropic scattering factor.
  Conclusions. The morphological symmetry of the disk contrasts with the
obvious brightness asymmetry. This asymmetry may be explained by the
coexistence of several types of grains in this disk and/or variable dust
density. Interaction with the interstellar medium was invoked by previous
authors as a possible explanation but other mechanisms may account for the
brightness asymmetry, for instance a recent collision in the disk
