nothing really inspired this one directly, although while making it I was thinkin about that scene at the end of half life 2 when the gman walks through that white door.
As for my psychedelia type art in general, I find a lot of my inspiration from my own experience (if u catch my drift) and from music like Tool, Psychedelic Porn Crumpets, Pink Floyd, Nine Inch Nails, Aphex Twin. There's quite a lot more but those are some of the more well-known examples I can give.