I've often been annoyed by the left/right divide being spoken about as linear. Its always felt more circular to me, you go far enough to the led or the right and its hard to tell the two sides apart.

Authoritarianism as a second axis is interesting, though I don't know what the opposite would be. Communism, the actual idea with effectively no one in charge? If so, in practice those extremes seem to end up in the same place, one or a few people in charge of everyone else with a very tight grip on power.