Here for excerpt three, The Fight in the Cave of the Moon Butchers, few ideas and colour schemes. Mostly playing with the scale and shadows.
"(...) what might be upon the floor of the cavern, but our grating lay in a depression whose rim hid all this from our eyes."
"(...) and then we saw that it filtered through a grating that barred our way. (...) I could see a limited portion of the cavern beyond. It was clearly a large space, and lit no doubt by some rivulet of the same blue light that we had seen flow from the beating machinery."