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I had the desire recently to paint a 'Tree of Life' in the Garden of Paradise, as Adam may have seen it. I figured that perhaps it might have appeared to Adam much like the Burning Bush later did to Moses (Exodus 3). I do not think these are entirely symbolic trees as Adam was in a real Garden and he and Eve were really tested. Adam is also in real genealogies coming down to the messiah. Just the same, much speculation exists.
If you look at Exodus 3 and the experience of Moses it says, 'burning bush', but I doubt if regular flames were witnessed by Moses. He obviously had a boo-rattelee moment and was in the focused presence of God, which was cleansing to Moses much like what Isaiah experienced in Isaiah 6. The tree of life obviously represented obediance to God and truth as well as symbolizing life. I figure that it had a glow about it and looked something like the way I painted it. What do you say?