Kotaku reader Catsy has spent the last three years (on and off) working on this behemoth of a tribute to the Halo universe, rendered entirely in LEGO.
It's a Halo Ringworld, and was shown off over the weekend at BrickCon 2012, where it won "Best Large Planetary Structure in the Space". Congrats, Catsy!
The outer ring of the structure is made out of eight individual segments that are 72 studs long, while the inner ring is held in place purely through tension.
Halo Ringworld [Catsy]