This is a pretty fucking amazing video for people who "grew up" around computers in the 80s, and 90s. This ("Second Reality by Future Crew") should be familiar to everyone here, I would hope!! It's pretty fascinating, even though its all in finnish.
Edit: Thanks for the +1 whomever repped! It actually reminded me I should probably actually link the video to the demo itself from the above. It might not look like anything special these days, but bear in mind this was from 1993, on MS-DOS and at the time was absolutely mind blowing.