The junction at the end of tunnel 11142, in the region called "ridged sediment sector". The wall pattern, while being semi-random, has regular ridges of growth-ring-like texture overlaid upon a regular texture reminiscent of eroded sedimentary rock, both apparently carved out using some form of automated tools. Note that the sedimentary pattern remains "horizontal" near the junction; in tunnel 111422 (up right) it gradually switches to circular, very regular ridges orthogonal to the tunnel direction while in 111423 (left) it abruptly ends and is replaced by a checker-like pattern with regular interspersions of "text".

Also worth noting is that the alignment of the picture is with the texture, not with local "up" or "down"; the local gravity field (0.001 G) points in the direction of the left wall.