Snapshot of the central region of the OBELISK, illustrating the physics modelled in the simulation. The complex gas distribution is shown on the left, the corresponding DM skeleton on the bottom, the gas temperature on the right highlighting self-shielded filaments (dark brown) and hot feedback bubbles (in yellow), and the upper part shows the H I photoionization rate with the knots of the cosmic web lit up by bright sources. The inset zooms in on the stellar distribution around the central galaxy.