I imagined and created this tray. The tray is inspired by the shape of the waves on the water when an object comes into contact with the surface of the water. Once the cup is placed on the tray, it seems that the latter causes the wave. The undulations are in relief and make it possible to accommodate the base of a saucer in order to facilitate the stability of the latter. You will find the sketchup file of the board but without textures. You will also find the plan on autocad. (3D made with Artlantis)