Planck SMICA CMB temperature fluctuation map, masked such that only the areas around nearby galaxies (upper panel) and voids (lower panel) are clearly visible. The mask consists of holes of 1 Mpc radius around all large nearby spiral galaxies in the most massive galactic filaments within z < 0.02 (see H2025 for details). The void holes includes one realization of SPARKLING voids, including all voids with Δ₂₃ < 0 out to z < 0.03 and extend to 1/2 void radius. The full CMB temperature map can be seen in the background. It can clearly be seen that the CMB temperature is mostly negative around galaxies and mostly positive in voids.