Spherical slices through the three dimensional vorticity of the velocity field at a distance R = 60 h⁻¹ Mpc from the observer in galactic coordinates. Left panel: projection of the vorticity vector along the line of sight, while right panel: absolute amplitude of the vorticity. As can be seen the vorticity traces the high density filamentary structure of the cosmic web. The left panel also hints towards the quadrupolar structure of the vorticity as found in simulations (see e.g., Laigle et al. 2015).