Answer:
So that we can get as close to perfect as possible =) Perfection is an static image as a goal in a dynamic reality. The incomprehension of reality's dynamics out of observation makes perfection constantly redefinable. Inside observation, the limits of mathematics do just the same. The perfect circle depends on how many digits you calculate, 3,14 is not as perfect as 3,14159264, which is less perfect than 3,14159264... .