Origin of local halo stars in the N21 simulation. The top row shows the present day stellar distribution, with local halo stars marked in red. The middle row shows the distribution of local halo stars 500 Myr ago, and the bottom row shows the global halo 500 Myr ago. In the XY and XZ projections, the t _lb = 500 Myr distributions of the local and global halo are notably different. This demonstrates that the orbits of local halo stars do not directly trace the spatial structure of the global halo. Meanwhile, in the YZ plane, the local and global halo stars occupy similar distributions, suggesting that in some projections the local halo orbits can reflect the spatial structure of the global halo.