Which is why I'm annoyed about whether its 土 or 地.Traditional Five is Earth the Elemental substance.
Imperial Eight is Earth the Ground. Imperials are all Locations
Looking at the Imperial Eight, which I don't think I've seen anywhere else, you can group them into 4 complimentaries/antitheses of each other: 天地;火水;山湖;雷风.
Heaven and Earth. Fire and Water. Mountains and Lakes. Thunder and Wind.
Heaven is the complimentary of Earth in Chinese culture. There're a few examples that I can think of for this. 天然地和, which means that all is right in the world, or 天地人和 which essentially means "golden opportunity due to the world working in your favour".
Fire and Water are obvious.
Mountain and Lakes is... More abstract. What I think this is going for is when talking about more classical art, mountains and water (which would usually be lakes), would be important to the composition of the more scenic pieces.
Thunder and Wind both fuck you up in storms. There are quite a few idioms which use both in that context.
Well yeah, may.