for the backrest convex concave curvature specifically tells the ai it s not a flat sheet radius edges ensures the edges look thick and premium rather than sharp for the seat saddle carved seat this is the industry term for that dent or dip in the middle contoured seat pan tells the ai the wood has been hollowed out for comfort non slip ergonomic indentation explains the function of the shape the seat with dent to prevent slipping keep original materials light wood seat and high polished acrylic backrest correct the yellow acrylic high polished backrest i can see slight wood finish with the acrylic