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I'm driving down the street and I'm following this thirty-foot-tall hospital gurney (It's a standard hospital gurney, only its legs are thirty feet tall.)
Remember when ever you are traveling, be it by car, bike, plane even your legs, it symbolizes a direction you are heading in your life. A path you are taking in life is like a career choice, education, religion, relationships and so forth.
A 30 foot tall hospital gurney is one of those ambigous, whatever you make of it yourself symbols. Definately a symbol though. In my opinion when ever I think of really tall mundane objects I think of something that is out of reach. So you are following this gurney, that is so tall there is no way you'd ever be able to get on it or get someone else on it. And being on a gurney, to me, would symbolize getting help or being treated for some kind of health condition. In psychological terms, this segment of your dream may mean that you are trying to or desire to somehow fix a part of yourself. Not that you are crazy or have some heal problem, but maybe there are aspects in your life where you do not feel fully satisfied or something else is troubling you (whatever is symbolized between the fighting animals perhaps).
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Later on, I enter the lobby of some building (I'm not sure what kind of building it was.) I see a hawk and a baby buffalo fighting each other inside a Plexiglas cage mounted on a wall.
The general idea about buidlings (be they a house, tower, shack, sky scraper or what have you) is that they represent the self. They encompass all that is you psychologically. To dream that you enter a building means you are looking within yourself to examine various aspects; introspection. The level you are on in a building represents your actual self awareness. So to be on the top floor suggests high awareness (even transcendence), whereas the basement represents no awareness (soemtimes remaining in the dark intentionally) or simply missing the picture altogether. The lobby is a bit more specific. It represents new awareness. As in you are just starting to become aware of something(s). So you are not totally unaware, as in being in the basement but you haven't had the chance (because you've just started to learn about this symbol) to really explore this aspect and understand it.
Of course, the aspect you are suppose to be looking at is related to the fighting animals. Fighting in general represents conflict. So somewhere within yourself you feel conflicted. And here is where dreams get fickle, the thing you may be in conflict over could be really simple. Like maybe what to wear to an important diner or what TV shows you want to watch. There is no way to gage the significance of these symbols. As a general rule of thumb, the more profound the dream (how vivid, intense and any other real emotional experience you had) the more significant the symbolism is.
But to disect this part of the dream:
Buffalo may represent a hardy aspect of your personallity. Something stubburn, powerful and strong. An earth elemental. Since this buffalo is a baby I would say the aspect of your personallity it represents is either something new, immature or something related to your childhood or your inner child.
A hawk is a predatory bird. Smart, opportunistic, a guide, helper for a hunter, a scavenger (thrifty) and a messenger from the Gods or your trancendental self (as most birds are considered to symbolize) and an air elemental.
It could be that your elements are off balance and you may need some good ole cleansing and grounding. Or it could mean that a part of your personallity that is strong and stubburn is at odds with another that might be a bit wiser or more mature and is trying to get you to see the "right way" of a given situation. Again the significance of the situation depends on how profound this dream was to you.