Eternity, said Frankie Lee with a voice as cold as ice; That's right, said Judas Priest, eternity, though you might call it paradise...
Maybe it's because of Agricola, but I've always interpreted the Walls and Feeding Trough action spaces as follows:
* you get for free only your first 2 fences of the game;
* you get for free only your first feeding trough of the game.
But now I'm not sure anymore… do those action spaces give you 2 fences/1 feeding trough each time you take them?
You get the free stuff each time.