Not necessarily non-linear, and pay no mind to my icon or handle when I say this, but Revolutionary Girl Utena is a meta narrative in the sense that it's portrayed as a stageplay within itself. This idea is toyed with through the shadow girls, through certain visual cues like the stage stab in the final episode, and the fairytale concept (princes, princesses, witches, white horses, etc. and what they represent) which is called back to in many instances throughout the show.