Design in the early- to mid-20th century was full of optimism.

Art deco and the "rocket age" look became staples.

Hyundai revealed the Hyundai HDC-6 Neptune on Monday, a hydrogen fuel cell-powered semi truck that looks like something from a cross between Tron and I, Robot.

Its striking looks graced the North American Commercial Vehicle Show in Atlanta, and the we received a few more details about the unique semi concept.

The automaker also mentioned it's learned a lot from its fuel cell passenger-vehicle program, most recently with the Nexo crossover, and it sounds like those lessons helped shape the HDC-6 Neptune.

With a hydrogen fuel-cell powertrain, the company said designers looked at the semi with a clean-sheet reinterpretation.

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