The simple connections were developed from much larger scale joints that Warren had studied on green timber building frames, and which he was interested in applying on a smaller scale. Because of his desire to minimise the environmental footprint, he was very ‘purist’, for instance eschewing steam bending to create a curve, instead using two laminations glued together. He also rejected accepted wisdom that no elements should be less than 20mm thick, paring them down to just 18mm.