Think of a circle. Stand two figures across from each other on each end of the circumference. This is how Mercury and Mars are dancing with each other. The opposition also means that they are in opposite sides of the zodiac. That partner over there is very much in your peripheral vision, and seems to demand attn.
Projection is the psychological domain of a projection.
According to Jeffrey Green's evolutionary model, it is at this opposition that we grow up and find our true place in that society in which we are immersed. The lesson I see ahead is to learn to accept those people around us who are the seeming adversaries. What lessons are WE needing to learn. The zealot's always look outside. The true seeker always finds the answers within.