Parabola West has one of the more appropriate names in the music. You start off thinking you're on a straight line, but, almost unawares, it curves, and you look around and find yourself in a totally unexpected place.
Purity of Weakness is the latest and best example. It is a marvelously conceived and executed roller coaster ride (parabola again) through swirling mists, smoke and fire - lots of fire. But I promise it is worth the trip.