Schematic diagram of the key elements in the WR 104 system. The geometry depicted is that of a face‐on view onto a 20° cone half‐angle pinwheel. The axis of the system and the line of shadow cast at 84° to the spiral origin (﹩\theta =0﹩) are indicated as dot‐dashed lines. Key elements are labeled, and some, such as the binary separation, are not to scale (depicted here about a factor of 10 too large).