[Nullifidian]

Originally Posted by SKG_Scintill

I don't see the perspective lines

Doesn't mean perspective wasn't used. You use perspective for everything, including human figures and organic material. It's what gives it that sense of depth.

Here's an image where you see the effect more obviously because there are square objects in the picture:



Notice how the characters all follow the same direction as the box shaped slot machines? A human figure drawn in perspective is basically a bunch of spheres, cubes and tubes if you simplified it, hence perspective is necessary.