I've cleared polarities going back to back. One than the other. I've also done that symbol process and felt it as William described. Here's a few more:
* I feel one feeling where ever it is. I leave it there just on the periphery of my awareness. I pull up it's opposite, usulally right out of the polar twin. I let my trance consciousness pull it up. I shift my attention back and forth between the two feelings (they may appear like split atoms, a fuzzy feeling form with a felt sense of splitness). I pay real close attention to them, feeling this dichotomy, shifting back and forth. Suddenly poof.
This is not an easy task for most. This comes from years and years of seated practice and absorption in mindulness and zen. I can look at some feelings and if they are connected up right, I will go straight away into a movie, a full and holographic life scene. This is second nature now.
This also comes from doing trance work. Basically I can be conscious dreaming by looking down inside and feeling something. Many of you report similar experiences from doing the M.G. and some of the other techs out there.
Another way of dealing with polarities is to feel one and put it up on a split screen. Then feel the other and put it up on the other side of the split screen. Then move and feel those images together. Watch them at a distance and see them blip out together.
You can bring those polarities together and spin them in a trance dream until they homogenize. They become one ambivalent feeling. Then fully experience that until it clears into a very strong essense.
These sorts of experiences can be very instructive about labels, beliefs, opposites, the polar nature of the watcher watching. Doing this kind of work can open you up to "no mind" suddenly or another way of being aware without content.
Have fun, Steve