HST images of Hen 2-161 (left, see also Sahai et al. 2011) and the Necklace (right; Corradi et al. 2011) highlighting their remarkably similar appearances (elongated with knotty waists). The image of Hen 2-161 is in the light of Hα+[N ii] λ6584 Å, measuring roughly 20′′× 20′′, while the Necklace image is a colour composite (Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)) measuring roughly 39′′× 35′′. Note that the central star of Hen 2-161 is offset to the northeast from the geometric centre of the nebular ring (in both images, north is up and east is to the left).