Examples of reionisation patches and their corresponding filament extracted from the segmentations of our simulations: the top panel shows a prolate-aligned region, and the bottom panel shows an oblate-perpendicular or butterfly region. In shades of pink, we show filaments, and rainbow colors indicate the z_reion region. The redder the region, the earlier it reionised. In contrast, the bluer the region, the later it reionised.