It seems to me that what your question is really about is less about capabilities of phenomina in the "outer world" but about how these very phenomina are perceived by human beings. If I am correct here your interest lies in the way how human beings organize perceptions in order to be able to handle them, or, more correctly, the accordant phenomina. It seems to me that in order to successfully incorporate a new concept into our essentially language-based knowledge system, we need to relate both by means of stressing similarities between the new concept and already incorporated concepts.
A promising technique to memorize a new concept - a necessity for every student - is obviously to relate it with its 'opposite', only that these 'opposites' seldomly fulfil what they promise by name, because reality is not composed of binary pairs but is much more complex. To organize knowledge by means of oppositions may be helpful at the beginning but it may also prove dangerous because it may prevent from deeper understanding.
To sum up, I don't think that phenomina in the outer world are organized essentially in oppositions but that man imposes this technique on the outer world. To idealize this tendency in human thinking inhibits the danger of inappropriate simplification and blindness to a third or fourth alternative.