Back in the day, caves were lit either by fires on the ground, or for the more discerning caveman, wall mounted torches (actually, I may have got that from Scooby Doo, but it's besides the point). The mancave is therefore lit, with these wall mounted 'torches' that cast a fiery glow upwards and add a distinctively cave-like presence.
Oh, and the artwork has been purposefully pixelated. All in good time.
