The pinkish nebula is irradiated by the hard UV light emitted from the 75000 K hot surface of the Wolf-Rayet star V 1770 Cyg. It is one prominent object in the beautiful summer milky way rich in objects where interstellar gas is illuminated by energetic astrophysical processes. The reason why we do not see the typical deep red colour of the H-alpha line of ionized hydrogen is the contribution of the H-beta line and the emission line of ionized oxygen in the bluish-green part of the visual spectrum.