Premise development and Additional ideas

This is some development on the idea of hallucinations, based on the feedback I received I researched the term more and looked into the things people hallucinate. The Oliver Sack TED talk was helpful in understanding the types of hallucinations and the science behind it. Also Anil Seth's TED talk was also helpful in terms of other possible directions I can take the story.  

In terms of other ideas, I thought of an idea where there are two beings represented by fire and ice. Their arguing and things start to escalate but then it cuts to reveal two siblings fighting. I feel like this idea is a bit generic, but it was an idea that popped into my head when I thought about my brother recently. The idea for fire and ice came from the fact if me and my brother had the same thing one would have a red version and the other a blue version.