Mr. Ken Tanaka, Saitama, Japan, just published an experiment he did with a styrofoam food box. He cut a corner in a nose flute shape (so clever idea to get the 3D countour!) and stuck a smaller piece inside, with the help of adhesive tape. Look! :
Ken Tanaka made also a short video to show the very convincing result:
You can also check his Youtube Channel (nervousgoat860126) which contains many other interesting nose flute videos!