[quote=Prisk]I’ve imagined it to be similar to Square Enix’s film The Spirits Within, and Final Fantasy 7 of course, with the Gaia-thingy—some form of physical substance within the planet itself that recycles spirits to provide the world with life. I haven’t given it an awful lot of thought, but I have thought about it at some point, and I think Olivia briefly mentions it in the Ascalon Isles flashback with Aaron, but passes it for mumbo jumbo.[/quote]
After reading this, I went searching for possible Gaia-ish/Lifestream/“Spirit World” (in some sense, I guess we can call it the “Heart of Atlas”) images for possible reference. 
[hider="Spirit World" 01][img]http://fc02.deviantart.net/fs8/i/2005/299/b/c/Spirits_within_by_Zeritel.jpg[/img][/hider]
[hider="Spirit World" 02][img]http://fc06.deviantart.net/fs13/f/2007/012/3/1/Neurone_by_CoherentLaserLight.jpg[/img][/hider]
[hider="Spirit World" 03][img]http://fc04.deviantart.net/fs16/f/2007/149/c/2/The_Planetarium_by_CoherentLaserLight.jpg[/img][/hider]
[hider="Spirit World" 04][img]http://fc09.deviantart.net/fs70/f/2011/248/b/7/neurons_and_synapses_by_drumurboy-d48ym9s.jpg[/img][/hider]
[hider="Spirit World" 05][img]http://fc05.deviantart.net/fs71/i/2014/164/0/7/neurons_by_aliwelles-d7m74yb.jpg[/img][/hider]
[hider="Spirit World" 06][img]http://fc03.deviantart.net/fs45/f/2009/106/9/f/Lifestream_by_SakuraPetalzz.jpg[/img][/hider]
[hider="Spirit World" 07][img]http://fc00.deviantart.net/fs8/i/2005/278/2/e/The_Spirit_Within_Gaia_by_AtticusVulpes.png[/img][/hider]
[hider="Spirit World" 08][img]http://fc07.deviantart.net/fs10/i/2006/129/d/d/Twister_Inversion_by_Esotera.jpg[/img][/hider]
Or something like [url=http://mushi-shi.wikia.com/wiki/The_River_of_Light]Mushishi’s River of Light[/url].

While fishing for images, I started to also wonder how spirits would perceive the world, so also looked for pictures that might work. For example, if a spirit “looked" at a deer standing in a field with a mountain in the distance, it would look like this:
[hider=Deer][img]http://fc06.deviantart.net/fs71/f/2014/065/b/0/daelephilia_by_archann-d794ldw.jpg[/img][/hider]
And if a spirit “looked” at a flower, it would look like this:
[hider=Flowers][img]http://fc07.deviantart.net/fs71/f/2014/222/f/7/purple_iris__by_kondratij-d7uk205.jpg[/img]
[img]http://fc08.deviantart.net/fs71/i/2014/215/4/d/orange_watercolor__by_kondratij-d7tha5a.jpg[/img][/hider]
[quote=Sixsmith]I just found the Sims 4 CAS Demo on Origin today and I've been slaving away at that because Sims!!!I would show you guys my creations, but I'm shy. Lemegablush.[/quote]
*Brofists fellow Simmer*