"The Son of Man" by Magritte, parodied using Halo Reach images.
The painting consists of a Spartan in green armor and an Assault Rifle standing in front of a scenic shore on halo, beyond which is the cloudy sky and the arching ring world. The Spartan's face is largely obscured by a hovering Frag Grenade.
I claim only to have arranged these pictures in the way you see them here. Frag grenade is taken from a Google image search for Frag Grenades, and the Spartan/background are off of bungie.net searching for view. All respect to the original screenshot taker. I just thought this would be funny/witty.