levitask vision chair's open hip angle design challenges 50 years of flawed ergonomics

Vision Chair rethinks how the human body interacts with seating

The Vision Chair by Levitask and designer Klaus Kummer represents the outcome of over forty years of research into posture and ergonomics. The chair challenges the conventional 90-degree seating position by proposing a dynamic alternative defined as Elevated Seating, a posture concept that distributes body weight more evenly and supports natural spinal alignment.

Kummer, originally trained as a cabinet maker before moving into industrial design in Germany and Scandinavia, combines traditional craftsmanship with ergonomic engineering. His approach prioritizes the body’s natural movement rather than constraining it to fixed angles. The Vision Chair is the latest expression of this philosophy, translating decades of experimentation and prototyping into a functional, movement-oriented design.

elevated seating promotes a natural spinal alignment through an open hip angle | all images courtesy of Levitask

Vision chair challenges the traditional 90-degree sitting posture

At the center of the design is the T-Mech™ mechanism, a patent-pending system that allows the chair to move in sync with the user’s body. By opening the hip angle beyond 90 degrees, it reduces pressure on the lower back and improves circulation. The position encourages a gentle forward rotation of the pelvis, maintaining the spine’s natural S-curve and enabling balance through motion, an effect inspired by the posture of a horse rider.

Structurally, the Vision Chair combines polished aluminum for the frame and base with recycled ABS shells. The seat and armrests use natural cotton upholstery and organically tanned leather, selected for durability and breathability. Biodegradable TPU wheels allow quiet and smooth mobility, aligning with the company’s focus on longevity and responsible material use.

The result is a chair designed to accommodate continuous movement rather than static sitting, offering a balance between comfort, posture, and mechanical precision. The Vision Chair extends Levitask’s and designer Klaus Kummer’s broader mission to reconsider everyday ergonomics through thoughtful material selection and motion-based design.

the posture supports the spine’s natural S-curve and relieves lower back pressure

function, posture, and design converge in a chair built for balance and motion

by cradling the pelvis and preventing forward slide, the chair preserves natural posture and stability

the polished aluminum frame provides both strength and stability

founded by Klaus Kummer, Levitask builds on over 40 years of craftsmanship and ergonomic research

project info:

name: Levitask: Vision Chair

brand: Levitask | @levitaskofficial
designer: Klaus Kummer

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edited by: christina vergopoulou | designboom