Two people are lost in the desert. The Sun is beating down on them and they are dying from hunger and thirst. Along the way, they come to a high wall and on the other side, they can hear the sound of a waterfall and birds singing. Above them, they can see the branches of a beautiful tree extending over the top of the wall, its branches laden with fruit.
One of them manages to climb over the wall and disappears down the other side. The other, instead, returns to the desert to help other lost travelers find their way to the oasis.