The zodiac pairs signs by what they do or don't do. The sign of the Taurus and the sign of the Scorpio compliment each other because while Taurus is concerned with physical stability, the Scorpio is concerned with emotional stability. Obviously, if these tow signs were exhibited in two individuals who were in a romantic relationship, they would compliment one another. This is simple to see. However, these two signs could be seen as literally opposite signs! How do you get an opposite sign out of that?
Well, depending upon interpretation, a person who exhibits the trait of being concerned with physical stability would only be interested in those things which would further his primary concern. Meanwhile, the Scorpio would not be able to understand these things because the Scorpio is centered on emotional stability. For example, one person may place a very heavy value on being right. There is nothing that is more important to this person than knowing and being able to prove that he/she is right about something. This would be the Taurus who is concerned with stability that can be established by proof. Meanwhile, the other person, the Scorpio, is more concerned with preserving the relationship; not fighting over who is right or wrong as long as in the end, the relationship was not damaged by harsh words, accusations, or out right painful words.
So, you can see how, while the zodiac calls the Scorpio and the Taurus compatible, complimentary signs while anyone who has ever been in a relationship could probably pick apart any combination of signs thrown at them and say they were truly an opposite sign combination.
The zodiac does, of course, recognize the union of those with an opposite sign as being a potential for good. The configurations put together by the zodiac are limited, as there are only twelve signs to combine, however if you are involved with someone who is a Gemini, who is concerned with the quest for knowledge and you are an Aries, concerned with your own personal interests, you might be able to share in a way that would help in the Gemini's quest for knowledge. (Just ask yourself; according to you, you know all and are all)
The "rule" of the zodiac can be countered at almost every combination of signs. This is because people's success in a relationship is not founded in their zodiac signs; it is founded in the commitment and dedication to making sure that, no matter what the sacrifice, they will never waver in their loyalty to the decision they made to be in the relationship. Don't be afraid to enter into a relationship with someone based on their assigned sign of the zodiac: it means nothing in determining the success or failure of your relationship...that's all on you!