^^^ Now you're just showing your age! No but seriously, "Second Reality" by Future Crew in 1993 was voted one of the top 10 hacks of all time by Slashdot.org. I remember watching this thing on a very low end 386, with something like 4MB of RAM and maybe 512K of video memory and I was mesmerized. They might as well be showing you this demo in 3D holography today, you'd be just as impressed as I was, it was borderline magic back then. It gets hella good after about 1:50. SECOND REALITY - BY FUTURE CREW, '93

https://www.youtube.com/watch?v=rFv7mHTf0nA

https://en.wikipedia.org/wiki/Second_Reality