Ever since I read Iain M. Banks' The Algebraist, about creatures who live on gas giant planets, I have dreamt of gas giant cities. Luckily, the amazing site ConceptArt.org issued a challenge a couple of years ago to design one.

Here's a gallery of some of the incredible work the concept artists came up with.

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ConceptArt has weekly challenges for designing environments and characters, and the results are often astounding. If you're a concept artist or just like to ogle beautiful art, I highly recommend joining ConceptArt.org!

By Ashton

By Psantha

By Joseph Feinsilver

By Joshua A Davis

By Relic

By Revenebo

By Hauke Vagt