Studies show 83% of students sit on incorrectly sized chairs. Especially due to height differentials within the same age group. “Schulstuhl” utilises an angularly mounted gas-piston to change both the seat height and depth proportionally. Children are able to adjust the chair to their individual body size simply in one interaction. Therefore the chair suits children from the age 6 to 14, not only providing a correctly sized chair for any child, but also offering the opportunity for schools to furnish different classrooms with the same chair.