I still remember long summer days spending at a river called Url in Upper Austria. Very often my sister and I let self-made yachts, which were made out of paper, bark, reed or nutshells, set sail.
My experiences as "naval architect" brought me to the decision to use the walnut as an inspiration. But in this case the nut is gliding above water instead of floating throughout. Out of glass and turned around it serves as front shield.