These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Faux Symbolism: Earthworld's rooms are based on the Western Zodiac; Fireworld's on the Kabbalah Tree of Life; Waterworld's on the Chakra points; and Airworld would have been based on the I Ching. And then there are the four elements, with each game set in a 'world' of one of the elements. But it doesn't mean anything.