An oasis is a spectacle in a desert because it audaciously sustains green and lovely things in the middle of a hostile environment. To the one on a journey through the wilderness whose eyes have grown accustomed to barrenness and sand, it reminds him that the desert is not the ultimate reality. There’s a destination on the other side of the wilderness, and an oasis is where a form of the final place pushes through the surface of the desert floor. It’s evidence of the life that’s at the end of the journey through the wilderness.