Bolometric intensity map of the non-magnetic simulation of a field of view of 9.6 × 9.6 Mm². The nMBP in the close-up on the left has a diameter of 80 km (resolved by approximately 8 × 8 computational cells). It has an intensity contrast of 35% with respect to the immediate neighbourhood but only 5% with respect to the global average intensity. A second nMBP is visible in the close-up on the lower right. Vertical sections along the blue lines in the close-up on the left are shown in Fig. 2. This figure is accompanied by a movie.