  After coming to rest on the night side of comet 67P/Churyumov-Gerasimenko,
the ROLIS camera on-board Rosetta's Philae lander acquired five images of the
surface below the lander, four of which were with the aid of LED illumination
of different colors. The images confirm that Philae was perched on a sloped
surface. A local horizon is visible in one corner of the image, beyond which we
can see the coma. Having spent a full day on the surface Philae was commanded
to lift and rotate, after which a final, sixth, LED image was acquired. The
change in perspective allowed us to construct a shape model of the surface. The
distance to the foreground was about 80 cm, much larger than the nominal 30 cm.
This caused stray light, rather than directly reflected LED light, to dominate
the image signal, complicating the analysis. The images show a lumpy surface
with a roughness of apparently fractal nature. Its appearance is completely
different from that of the first landing site, which was characterized by
centimeter to meter-sized debris (Mottola et al., 2015). We recognize neither
particles nor pores at the image resolution of 0.8 mm per pixel and large color
variations are absent. The surface has a bi-modal brightness distribution that
can be interpreted in terms of the degree of consolidation, a hypothesis that
we support with experimental evidence. We propose the surface below the lander
to consist of smooth, cracked plates with unconsolidated edges, similar to
terrain seen in CIVA images.
