Creative people are famously unstable, both emotionally and in their thinking; the artistic temperament is moody, and creators openly tolerate polarities in ideas and viewpoints that others reject, and then try to bury. Oscillations between two distinctly different modes of thinking may account for a lot of this instability and openness. Creators are more skilled in the combined use of two kinds of thought processes: linear thinking, which is verbal, logical, sequential, and analytic; and non-linear thinking, which is associative, more image oriented, non-sequential, and non-logical (but not irrational).
Janusian thinking is the combined use of logical and associative thinking. It can make a creative person appear unstable.