Although it's not strictly trance, it does share a lot of elements with the progressive trance of its time (or, instead, the opposite - early 2010s progressive trance shares a lot with Deadmau5's style).
I'm surprised that HR 8938 is already more than 10 years old. Always thought it was more recent.
Once you get past the "Deadmau5 sound," you can tell this track captures the outer spacey feeling that trance fans enjoy in old trance.