Locations of the Taurus MC, Local Bubble, and the Per-Tau shell in an X-Z projection in heliocentric Galactic Cartesian coordinates. The X-axis (X′) has been rotated counterclockwise by θ = 33° to show the best view of the intersection of the two shells. The red points correspond to the 3D model of the dense gas in Taurus presented in Zucker et al. (2021), based on the 3D dust reconstruction presented in Leike et al. (2020). The Local Bubble surface, shown in purple, corresponds to the structure identified in Pelgrims et al. (2020), based on the 3D dust reconstruction presented in Lallement et al. (2019). The Per-Tau shell surface, shown in green, corresponds to the structure identified in Bialy et al. (2021), based on the 3D dust reconstruction presented in Leike et al. (2020). Taurus lies at the intersection of the two surfaces.