Deep close-up view of the Sh 2-296 nebula in Hα with significant labels added (image courtesy of S. Guisard (sguisard.astrosurf.com) and T. Demange (www.capnature.com)). This view vividly illustrates the ionized evaporation features that flow away from the adjacent molecular clouds: long (up to ~10 pc) filaments, smaller scale eggs and pillars (e.g., near the Herbig Be star Z CMa, or the SFO 29 filament), and bright dense corrugations. Interacting with this flow, the runaway O star HD 53974 has created a conspicuous bow shock (see text, Sect. 2, and Fig. 4). Given the evaporation features, it is plausible that the bubble edge is located behind the Lynds dark nebulae LDN1657A and LDN1657B.