Three-dimensional model of η Car’s outer ejecta seen from Earth (left) and from the side (right) with the bipolar Homunculus nebula in the center (dark red and blue lobes). The model has been constructed with SHAPE and the Hβ emission and velocity (over a range of ± 3000 km s ^-1) information extracted from the MUSE data. The outer ejecta form a partial bent cylinder. The open cylinder parts are not observed in the MUSE data, i.e., we only trace the bottom of the shell moving toward us and the top of the shell moving away from us. The open cylinder parts are likely too faint, perhaps due to only weak interactions with less dense surrounding material. This large tube is probably bent or indented due to material being slowed down by interactions with the environment. The ghost shell (green) is in our line of sight to the southern Homunculus lobe and consists of two closely aligned shells. An additional half-shell (green mesh, complementing the bottom of the large cylindrical shell moving away from us) lies behind the northern Homunculus lobe. The bowshock-like feature is displayed in yellow. The colors are selected to distinguish the different shapes selected for the SHAPE modeling.