I wanted to train the fish to swim through a tube and started with a short piece 60 mm long, 35 mm in diameter. They showed no particular interest. Only when I charged it with mosquito larvae they passed through.
Each animal faces a small number of objects within its living environment with which it has closer or more distant relations.
Only the relationship transforms the object into the bearer of a meaning that is imprinted on it by a subject.
adapted and translated from: Uexküll, Jakob von. Streifzüge durch die Umwelten von Tieren und menschen. Bedeutungslehre. Hamburg: Rowohlt, 1956. pp 105, 106