Halo has always been a very visually unique game series. When making the first Halo, Bungie drew design inspiration from many sources despite the graphical limitations of the technology in 2001. The first Halo held within it three distinct and clashing visual styles that have remained in every subsequent game in the series. First and foremost, Halo is described as having a military sci-fi aesthetic which refers to a lot of the game’s human made equipment. From the guns and vehicles, to Master Chief’s iconic green Mjolnir armour, most of Halo’s human equipment is inspired by militaristic designs.
Halo’s second iconic visual style comes from the enemies and equipment that make up the Covenant forces. These alien devices work similarly to the human made equipment but have a clear cultural disconnect from anything human made.
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The third main visual style present in the Halo series is in the design of the Halos themselves. In the game's lore these planet sized rings were built by an ancient Forerunner race, and so contain a mix between alien Forerunner style architecture and distinctly Earth-like environments. When using Earth as inspiration for an alien world it is common for designers to use only its most visually striking locations and phenomenon. One such real-world inspiration for Halo Infinite has been pointed out in a clip by Reddit user LouisVchinchila.
Originally posted by a Reddit user named mb557x the clip shows Fingal's Cave in Scotland, one of the world's rare locations for naturally formed hexagonal basalt columns. These columns were used as inspiration in designingHalo Infinite’s Zeta Halo as a way of introducing alien Forerunner
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