The shades of the sky have been mentioned in several episodes.
- 3 - Station Management - Monday: turquoise, Tuesday: taupe, Wednesday: robin's egg, Thursday: turquoise-taupe, Friday: coal dust, Saturday: coal dust with chances of indigo in the late afternoon, Sunday: void
- 10 - Feral Dogs - a soft, quivering green
- 17 - Valentine - a midday night sky that had grown cancerous with blinking stars
- 22- The Whispering Forest - "ever-widening night sky"
- 25- One Year Later - "mostly void, partially stars"