Two Hubble Space Telescope images, with the top panel showing the grand-design spiral galaxy Messier 74 (M 74) which demonstrates a prominent dust lane and a luminous, blue stellar region, offset from each other in one of its spiral arms. The bottom panel displays a more flocculant spiral galaxy, Messier 83 (M 83), which tends toward a disordered configuration of dust, gas, and stars which may be more analogous to the Milky Way. The overlaid drawings are meant to represent the resemblance of the Orion arm’s dust and OBA offset shown in Figs. 1 and 2 to those seen in these face-on spiral galaxies, with the red line and the blue rectangle depicting the Radcliffe wave and the P21 Orion arm, respectively. These representations of the Orion arm have been drawn approximately to scale based on the distance measurements to M 74 and M 83.