Andrew Frost, Perfect Posture Stool in Black (Furniture)

This is a fitted, made to measure, ergonomic stool, in ebonised African mahogany. The seat is reinforced across the grain by two 19 x 19mmm splines inset on the underside. The leg-seat joint is a stepped dowell mortise and tenon, glued and wedged.This joint has such strength that rungs for bracing have been eliminated. See image of unstained joint. Just as our shoes must fit our feet, so, I believe, our seating should fit our bodies and be based on sound ergonomic principles. The seat slopes forward at an angle of 7 degrees from the horizontal. This slope lowers the knees and thighs, preventing over-rotation of the pelvis and preserves the natural lordosis ( lower lumbar reverse curve) in the lower back.The upper body is thus allowed to come forward slightly into perfect balance over the pelvis and buttocks, much reducing any need for back support. When sitting in a horizontal or backward sloping seat, the upper body is forced backwards, demanding support. This balanced posture is perfect for office/desk work, as long as keyboard and screen heights are correct. It is also perfect for meditation, especially for those of us with ageing knees which protest at cross-legged sitting. Standing from a sitting position is easier as the upper body is already raised by about 50mm relative to the knees. The carefully shaped holes in the seat bottom relieve pressure on the sit-bones under the pelvis and help resist any downslope movement of the buttocks. My ergonomic stool and chair designs are the result of over five years of research, trial and error and were largely inspired by my own struggles with chronic back pain. My design priorities are simplicity, functionality, beauty, and strength. I provide a lifetime warranty with all pieces. They are built to last generations. References: "The Seat of Your Pain may be Your Chair" by Jenny Pynt. Kangaroo Press. 1998. " The tyranny of chairs : Why we need better design" by Sarah Hendren. Guardian Australia. 26/8/2020.

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