Question: Vortex Garten is a garden that alludes to the discovery of levitational force by the naturalist of what nationality?
Sentence (from "Viktor Schauberger"): Viktor Schauberger (30 June 1885 in Holzschlag, Upper Austria – 25 September 1958 in Linz, Austria) was an Austrian forest caretaker, naturalist, pseudoscientistref>Ronald Engert: "Die Forellenturbine als Prinzip der kostenlosen Energiegewinnung.
Relevant evidence: Yes