Dream interpretation, as I see it, is a bit of a self-fulfilling prophecy.
Let me start by saying that I don't believe dreams involve any sort of purposeful 'symbolism' created by your subconscious to 'tell you things'. I am not basing this on any specific science, just a gut feeling - the idea stinks of fantasy to me. Your sub-conscious is not a separate entity, it is simply the subroutines that you aren't aware of during normal consciousness.
Anyways, as far as I can guess, dreams seem to be largely based on your brain's world model and how your brain expects the world to work. Now, if you believe in dream symbolism deeply to the point where it percolates into your sub-conscious expectations of the significance of these symbols in the world, then when you dream about a related subject you are quite likely to incorporate this symbolism.
Essentially, if you were to convince yourself that gumballs signify death, then when you happen to have a dream involving death and your brain trawls through its world model to find suitable furniture, it would probably incorporate gumballs somehow. This is just by virtue of connecting the two concepts strongly enough that one calls up the other.
Obviously, if you don't
know the symbolism, it doesn't make any sense to expect it to work - unless you're going to claim that untied shoes are naturally linked to impotency in all human brains. These symbols have to be built up by our culture and our beliefs, or maybe reading enough of these nonsense dream interpretation books
I could obviously be terribly wrong, but this is how I see it at the moment.
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