"No one even knows what a “good” chair would have to do, hypothetically, let alone how to make one. Some ergonomists have argued that the spine should be allowed to round forward and down in a C-shaped position to prevent muscular strain, but this pressurizes the internal organs and can cause spinal discs to rupture over time. Others advocate for lumbar support, but the forced convexity that this creates is not much better in the short run and can be worse in the long: it weakens the musculature of the lumbar region, increasing the likelihood of the very injuries it’s meant to prevent. There are similar debates over seat height, angle and depth; head, foot and arm support; and padding. Galen Cranz, a sociologist of architecture and perhaps the world’s preeminent chair scholar, has called ergonomics “confused and even silly.” For designers without a scientific background, it’s a clusterfuck."