The World of Elements

According to the Greeks and very early physicians, there are four elements: earth, air fire, and water. But I've read in Hinduism and Buddhism there are five elements: earth, fire, air/wind, water, and aether. Water's Memory has four, earth, air, fire, and water. I may introduce the fifth element, but later on. Can we say sequel?  Each one of the elements in Water's Memory have different occupations. I tried to assign them jobs indicative of their qualities. Some of my earth elements run a jewelry store. There is also an earth element that is a physician. The air or wind element works with the earth element, and she may be the love interest of the physician. I enjoyed writing about the fire elements. There are three of them, identical triplets. Last, but not least, is the water element. She's one of my main characters. She also has a few issues, but all main characters have them, right? Now, the only element left is aether. This element won't be featured won't be featured in Water's Memory, but that doesn't mean that he or she won't make a debut until later. I'm working on notes for another project, which could be a sequel to Water's Memory and looking forward to getting started.