Purely a concept, this lounge chair would be made from one solid piece of material, whether it be steel, plastic, or carbon fiber.  The chair looks as if it would fall forward but most of the weight is situated in the back, allowing it to stay level. The form allows the user to get up easier by rolling forward slightly.
Helix Lounge Chair
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Helix Lounge Chair

The Helix chair is a concept and does not exist physically, only in theory, but it does have the potential to be manufactured.

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