Help me dig deeper into possible questions for this show

Well firstly the Haibane, with their small, gray wings and halos, symbolize beings in a state of limbo. They represent souls that are in a process of purification or self-discovery before they can move on to the next stage of existence. Their charcoal-colored wings might also suggest a state of incompleteness or imperfection, unlike the pure white wings traditionally associated with angels.

Haibane are born from cocoons, which symbolize rebirth or awakening. The dreams they experience within the cocoon often hold clues to their past lives or the issues they need to resolve.

You also might mention "The wall" surrounding the town that represents the boundaries of the world the Haibane live in. It can be seen as a metaphor for the limits of their understanding or the barriers they need to overcome to achieve self-realization. The wall also suggests a separation from the world of the living, reinforcing the idea that the Haibane are in a transitional state.

The halo worn by the Haibane can symbolize divine grace or the potential for spiritual elevation. What's interesting is that the town itself can be seen as a purgatorial space, where the Haibane live while working through their past sins or unresolved issues. It is a place of refuge, where they can reflect on their lives and prepare for their eventual "Day of Flight."

The "Day of Flight" is when a Haibane leaves the town, symbolizing the soul's departure to the next stage of existence. This can be interpreted as the soul achieving redemption or resolving its past burdens.

These are the general concepts and the meaning behind them. Rakka's journey serves to unveil them in order to make it accessible to the audience and make their interpretations. If you have other thins or othet metaphors you want to know, hit me up 😉

I recommend taking a look at the manga. Unlike most series, the anime is not an adaptation. Instead the manga is more like a supplement to the anime.