Like two prongs at the top of a tight horseshoe. nice metaphor.

but for a better overall picture I was shown at college that a two dimensional graph was instructive.

left and right on the horizontal and tough upwards, tender downwards.

Not so easy then to see leftists crossing the tough bridge to the right (& vice versa), but maybe they can see each other over the horizon from the elevated position. If not actually shake hands.

from the Chinese insult (& I don't remember angering the Gods personally) - we live in interesting times and historical norms don't apply.