I love the cage idea. Hanging foliage could give it a real creepy look.
So many good ideas here :D I like the new walkway arrangement, gives it a function within our level. Does it still attach to the first floor door? Saw the new roof window idea earlier, think it's much more aesthetically pleasing. The cage on the walkway looks so great :D I just remembered it from Jurassic Park, and it works so well. Almost makes me want to fog out the level and add in some flying monsters.The red in the colour plan strikes me as nice, maybe if we colour our glass a little through natural/artificial means we could get some red light in the atrium to really give it a nice visual theme.