What a strong image! An old tree and the mushroom of a nuclear explosion. Isn't it bizarre how beautiful both are?
I believe both resemble the incarnation of what some people describe as the power of God. It shows the two opposed facettes of the universe - good and evil - and that both can be perceived as perfectly beautiful in their own rights.
But it also shows how similar the most different objects can be in a purely geometrical way. Which is a clear indicator for the idea that the universe follows one ultimate set of laws: The laws of Maths. Or to put it in other words: God is Maths = Maths is God.