God is perfect. God makes things move in circles. The planets circle. God provides consistency in all things. The more consistent things are, the more perfect things are.
Perfection is only an idea.
The true perfect tree is but an idea, because it does not in fact exist. Perfection is an idea in the mind of God. The true perfect tree, if it existed, would be like all other true, perfect trees. Perfect trees would all be alike. To compensate for our own imperfections, we invented machines.